Fix FileInterceptor to properly check read / write sides path separation

[reta]

Description

Fix FileInterceptor to properly check read / write sides path separation

Related Issues

N/A

Check List

• Functionality includes testing.
• API changes companion pull request created, if applicable.
• Public documentation issue/PR created, if applicable.

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[reta]

@andrross @kumargu @RajatGupta02 please take a look folks, thank you

[github-actions]

❌ Gradle check result for a54bd73: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[github-actions]

❌ Gradle check result for 7953c74: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[github-actions]

❌ Gradle check result for 7953c74: FAILURE

Please examine the workflow log, locate, and copy-paste the failure(s) below, then iterate to green. Is the failure a flaky test unrelated to your change?

[github-actions]

✅ Gradle check result for 7953c74: SUCCESS

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 20 lines in your changes missing coverage. Please review.

Project coverage is 72.42%. Comparing base (c91cdcb) to head (7953c74).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
...java/org/opensearch/javaagent/FileInterceptor.java	0.00%	20 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main   #17836      +/-   ##
============================================
- Coverage     72.46%   72.42%   -0.04%     
- Complexity    66502    66527      +25     
============================================
  Files          5408     5408              
  Lines        308080   308168      +88     
  Branches      44720    44744      +24     
============================================
- Hits         223239   223183      -56     
- Misses        66536    66798     +262     
+ Partials      18305    18187     -118     

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