meta.json stub file trips up meta_nf_meta_key linting

Description of the bug

Hi all,
This links to https://github.com/nf-core/modules/pull/11373

The blobtk/create module creates a minimal blobdir (blobtoolkit directory) which has a specific format.

One of the files it produces is a meta.json. This seems to be tripping up on the meta.json, value in the stub, not being a valid meta (map) value.

These files make up the minimal definition of a blobdir

    stub:
    prefix      = task.ext.prefix ?: "${meta.id}"
    """
    mkdir -p ${prefix}
    touch ${prefix}/meta.json
    touch ${prefix}/gc.json
    touch ${prefix}/identifiers.json
    touch ${prefix}/n.json
    touch ${prefix}/ncount.json
    touch ${prefix}/length.json
    """

Also meta_nf_meta_key doesn't seem to be documented here: https://nf-co.re/docs/nf-core-tools/api_reference/4.0.1/module_lint_tests/main_nf

I know there's other linting errors with the modules, i'm fixing those at the minute.

Command used and terminal output

conda create --name nf-core_4 nf-core nextflow

---> installs
  nextflow           bioconda/noarch::nextflow-26.04.0-h2a3209d_0
  nf-core            bioconda/noarch::nf-core-4.0.0-pyhdfd78af_0
  nf-test            bioconda/noarch::nf-test-0.9.5-h2a3209d_0

git clone https://github.com/nf-core/modules.git
git switch new_blobtk_modules

nf-core modules lint blobtk/create


INFO     Linting modules repo: '.'
INFO     Linting module: 'blobtk/create'

╭─ [!] 2 Module Test Warnings ─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╮
│               ╷                                       ╷                                                                                                                          │
│ Module name   │ File path                             │ Test message                                                                                                             │
│╶──────────────┼───────────────────────────────────────┼─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╴│
│ blobtk/create │ modules/nf-core/blobtk/create/main.nf │ container_links: Unable to connect to container registry, code:  404, url:                                               │
│               │                                       │ https://community.wave.seqera.io/library/blobtk:0.8.0--2fe0d833a26e0cd9                                                  │
│ blobtk/create │ modules/nf-core/blobtk/create/main.nf │ main_nf_container: Container versions do not match                                                                       │
│               ╵                                       ╵                                                                                                                          │
╰──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯
╭─ [✗] 1 Module Test Failed ───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╮
│               ╷                                       ╷                                                                                                                          │
│ Module name   │ File path                             │ Test message                                                                                                             │
│╶──────────────┼───────────────────────────────────────┼─────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╴│
│ blobtk/create │ modules/nf-core/blobtk/create/main.nf │ main_nf_meta_key: Invalid 'meta' keys detected: meta.json                                                                │
│               ╵                                       ╵                                                                                                                          │
╰──────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯
╭───────────────────────╮
│ LINT RESULTS SUMMARY  │
├───────────────────────┤
│ [✔]  51 Tests Passed  │
│ [!]   2 Test Warnings │
│ [✗]   1 Test Failed   │
╰───────────────────────╯

System information

No response

Start by running nf-core modules lint blobtk/create against modules/nf-core/blobtk/create/main.nf and review the main_nf_meta_key test in the nf-core tools lint implementation. Compare the reported meta.json stub output with the documented module lint tests; done means the valid blobdir stub no longer produces an incorrect failure and the behavior is covered by an appropriate test.