Memory leak related to `resultCache` in TestResultAction

### Jenkins and plugins versions report

Environment

```text

Jenkins: 2.462.1
OS: Linux - 6.8.4-3-pve
Java: 21.0.2 - S.A. (OpenJDK 64-Bit Server VM)
---
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```

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

Controller: Ubuntu 20.04.6 LTS
Agents: Ubuntu 20.04.6 LTS

### Reproduction steps

Having the resultCache of TestResultAction enabled caused a slow memory build up for us. The problem seems to have started 3-4 weeks ago when we probably updated plugins along with a needed restart we had to do.

From then on, in a weeks time, more and more heap was being used until we were exhausting the 60GiB max heap.

### Expected Results

Memory usage should not steadily increase over time.

### Actual Results

Memory steadily building up until OOM
Note that the smaller hile in the middle was due to an unrelated controller restart.

Sadly I cannot recall (or know where to lookup) what changed around 3,4 weeks ago when the memory build up started to happen. But it looks like a recent change caused this.

### Anything else?

Clearing the resultCache (resultCache.clear()) freed up the 'lost' memory

We disabled the cache via `hudson.tasks.junit.TestResultAction.RESULT_CACHE_ENABLED` and from now (26/09/2024) on , it looks like the memory build up is not happening anymore.

### Are you interested in contributing a fix?

Potentially yes, if can find some time, not an expert in Java though, so I might no be able to identify the source of the leak.