"Ignore builds for non-code related MR updates" causing code related MR updates to be ignored

### Jenkins and plugins versions report

Environment

```text
Jenkins: 2.395
OS: Linux - 5.4.0-1104-azure
Java: 11.0.18 - Eclipse Adoptium (OpenJDK 64-Bit Server VM)
---
ace-editor:1.1
active-directory:2.30
apache-httpcomponents-client-4-api:4.5.14-150.v7a_b_9d17134a_5
authentication-tokens:1.4
blueocean:1.27.2
blueocean-bitbucket-pipeline:1.27.2
blueocean-commons:1.27.2
blueocean-config:1.27.2
blueocean-core-js:1.27.2
blueocean-dashboard:1.27.2
blueocean-display-url:2.4.1
blueocean-events:1.27.2
blueocean-git-pipeline:1.27.2
blueocean-github-pipeline:1.27.2
blueocean-i18n:1.27.2
blueocean-jwt:1.27.2
blueocean-personalization:1.27.2
blueocean-pipeline-api-impl:1.27.2
blueocean-pipeline-editor:1.27.2
blueocean-pipeline-scm-api:1.27.2
blueocean-rest:1.27.2
blueocean-rest-impl:1.27.2
blueocean-web:1.27.2
bootstrap4-api:4.6.0-3
bootstrap5-api:5.2.1-3
bouncycastle-api:2.26
branch-api:2.1071.v1a_188a_562481
caffeine-api:2.9.3-65.v6a_47d0f4d1fe
checks-api:1.8.0
cloudbees-bitbucket-branch-source:791.vb_eea_a_476405b
cloudbees-disk-usage-simple:178.v1a_4d2f6359a_8
cloudbees-folder:6.795.v3e23d3c6f194
command-launcher:90.v669d7ccb_7c31
commons-lang3-api:3.12.0-36.vd97de6465d5b_
commons-text-api:1.10.0-27.vb_fa_3896786a_7
config-file-provider:3.11.1
configuration-as-code:1569.vb_72405b_80249
credentials:1214.v1de940103927
credentials-binding:523.vd859a_4b_122e6
dark-theme:315.va_22e7d692ea_a
display-url-api:2.3.7
docker-commons:419.v8e3cd84ef49c
docker-java-api:3.2.13-37.vf3411c9828b9
docker-plugin:1.3.0
docker-workflow:563.vd5d2e5c4007f
durable-task:504.vb10d1ae5ba2f
echarts-api:5.4.0-1
favorite:2.4.1
font-awesome-api:6.2.1-1
generic-webhook-trigger:1.86.2
git:5.0.0
git-client:4.1.0
git-server:99.va_0826a_b_cdfa_d
github:1.37.0
github-api:1.303-400.v35c2d8258028
github-branch-source:1696.v3a_7603564d04
gitlab-api:5.0.1-78.v47a_45b_9f78b_7
gitlab-branch-source:645.v62a_b_6fce8659
gitlab-plugin:1.7.9
handy-uri-templates-2-api:2.1.8-22.v77d5b_75e6953
htmlpublisher:1.31
http_request:1.16
instance-identity:142.v04572ca_5b_265
ionicons-api:31.v4757b_6987003
jackson2-api:2.14.2-319.v37853346a_229
jakarta-activation-api:2.0.1-2
jakarta-mail-api:2.0.1-2
javax-activation-api:1.2.0-6
javax-mail-api:1.6.2-6
jaxb:2.3.8-1
jdk-tool:63.v62d2fd4b_4793
jenkins-design-language:1.27.2
jersey2-api:2.38-1
jjwt-api:0.11.5-77.v646c772fddb_0
job-dsl:1.81.1
jquery-detached:1.2.1
jquery3-api:3.6.1-2
jsch:0.1.55.61.va_e9ee26616e7
junit:1166.va_436e268e972
kubernetes:3896.v19b_160fd9589
kubernetes-client-api:6.4.1-215.v2ed17097a_8e9
kubernetes-credentials:0.10.0
labelled-steps:1.0
mailer:438.v02c7f0a_12fa_4
matrix-auth:3.1.6
matrix-project:785.v06b_7f47b_c631
metrics:4.2.13-420.vea_2f17932dd6
mina-sshd-api-common:2.9.2-50.va_0e1f42659a_a
mina-sshd-api-core:2.9.2-50.va_0e1f42659a_a
monitoring:1.92.0
mstest:1.0.0
okhttp-api:4.9.3-108.v0feda04578cf
opentelemetry:2.11.0
pipeline-build-step:2.18
pipeline-graph-analysis:202.va_d268e64deb_3
pipeline-groovy-lib:629.vb_5627b_ee2104
pipeline-input-step:466.v6d0a_5df34f81
pipeline-milestone-step:101.vd572fef9d926
pipeline-model-api:2.2118.v31fd5b_9944b_5
pipeline-model-definition:2.2118.v31fd5b_9944b_5
pipeline-model-extensions:2.2118.v31fd5b_9944b_5
pipeline-multibranch-defaults:2.1
pipeline-rest-api:2.31
pipeline-stage-step:296.v5f6908f017a_5
pipeline-stage-tags-metadata:2.2118.v31fd5b_9944b_5
pipeline-stage-view:2.31
pipeline-utility-steps:2.15.1
plain-credentials:143.v1b_df8b_d3b_e48
plugin-util-api:2.18.0
popper-api:1.16.1-2
popper2-api:2.11.6-2
prometheus:2.1.1
pubsub-light:1.17
resource-disposer:0.20
scm-api:631.v9143df5b_e4a_a
script-security:1229.v4880b_b_e905a_6
slack:631.v40deea_40323b
snakeyaml-api:1.33-90.v80dcb_3814d35
sse-gateway:1.26
ssh-credentials:305.v8f4381501156
ssh-slaves:2.854.v7fd446b_337c9
sshd:3.249.v2dc2ea_416e33
structs:324.va_f5d6774f3a_d
support-core:1266.v6d096c154c90
theme-manager:1.6
token-macro:321.vd7cc1f2a_52c8
trilead-api:2.84.v72119de229b_7
variant:59.vf075fe829ccb
workflow-aggregator:596.v8c21c963d92d
workflow-api:1208.v0cc7c6e0da_9e
workflow-basic-steps:994.vd57e3ca_46d24
workflow-cps:3618.v13db_a_21f0fcf
workflow-cps-global-lib:609.vd95673f149b_b
workflow-durable-task-step:1223.v7f1a_98a_8863e
workflow-job:1282.ve6d865025906
workflow-multibranch:733.v109046189126
workflow-scm-step:400.v6b_89a_1317c9a_
workflow-step-api:639.v6eca_cd8c04a_a_
workflow-support:839.v35e2736cfd5c
ws-cleanup:0.44
```

### What Operating System are you using (both controller, and any agents involved in the problem)?

Linux (using Jenkins official docker images on both)

### Reproduction steps

1. Configure on a GitLab multi-branch project with defaults job with webhook integration globally configured
2. Enable "Ignore builds for non-code related MR updates"
3. Send a push on the remote repository

### Expected Results

As the code changed on the target repository, the expected result would be a job being triggered for the target branch.

### Actual Results

The webhook is delivered on Jenkins, as confirmed on logs, but the pipeline never gets triggered. With the option enabled, the only time a pipeline gets triggered is when a new merge request is created -- after that, no changes pushed will trigger a new pipeline to run.

### Anything else?

If the option "Ignore builds for non-code related MR updates" is removed, webhook integration works as expected, however whenever someone assigns the merge request to another person, or makes comments on it, a pipeline always gets triggered.,makes