[Backport 2.17] Add dedicated string prefix for remote index metadata and remote routing table

[soosinha]

Description

Backport 1935650 from #15575

Check List

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

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[github-actions]

❌ Gradle check result for 75b9bc9: 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 92c8301: UNSTABLE

Please review all flaky tests that succeeded after retry and create an issue if one does not already exist to track the flaky failure.

[codecov]

Codecov Report

Attention: Patch coverage is 97.22222% with 1 line in your changes missing coverage. Please review.

Project coverage is 71.64%. Comparing base (75fb5bc) to head (5ce8f5e).
Report is 16 commits behind head on 2.17.

Files with missing lines	Patch %	Lines
...arch/gateway/remote/model/RemoteIndexMetadata.java	91.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               2.17   #15740      +/-   ##
============================================
- Coverage     71.66%   71.64%   -0.03%     
- Complexity    64317    64398      +81     
============================================
  Files          5262     5263       +1     
  Lines        301148   301211      +63     
  Branches      43841    43847       +6     
============================================
- Hits         215829   215800      -29     
- Misses        67259    67441     +182     
+ Partials      18060    17970      -90     

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[github-actions]

❌ Gradle check result for d9b26e0: TIMEOUT

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 5ce8f5e: SUCCESS