Remove HC from tenant rate limiting

[Nabeel Nauman (nabeelnauman)]

When observing the tenant rate limiting dry-run data, it was observed that the current implementation would incorrectly rate limit HC clients. We don't want this. This PR adds logic to skip tenant rate limiting if it's HC making the request.

[Copilot]

Pull request overview

Adds a health-check detection path so tenant rate limiting (and the dry-run classifier) can skip Confluent Health Check (HC) traffic that was previously being counted/limited.

Changes:

• Introduces TenantUtils.isHealthCheckRequest(HttpServletRequest) to identify health-check URIs.
• Skips tenant dry-run classification/rate-limit tracking for health-check requests.
• Skips tenant DoS filtering for health-check requests.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 4 comments.

File	Description
core/src/main/java/io/confluent/rest/TenantUtils.java	Adds health-check request detection helper used to bypass tenant rate limiting.
core/src/main/java/io/confluent/rest/TenantDryRunFilter.java	Early-returns to skip dry-run rate-limit classification for health-check requests.
core/src/main/java/io/confluent/rest/TenantDosFilter.java	Early-returns to bypass tenant DoS filter for health-check requests.
core/src/test/java/io/confluent/rest/TenantUtilsTest.java	Adds unit tests for isHealthCheckRequest.

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