e2e: update the test for shared rate limits without client selectors

[Aias00]

What type of PR is this?

increase global shared rate limit in test data to 100, update the E2E test for shared rate limits without client selectors
fix this: https://github.com/envoyproxy/gateway/actions/runs/21241339852/job/61121125255

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

Release Notes: Yes/No

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[Copilot]

Pull request overview

This PR updates the global shared rate limit test data and strengthens the E2E test that verifies gateway-level shared rate limits without client selectors, to reduce flakiness and align with the new 100-requests-per-hour limit.

Changes:

• Increase the gateway-level global shared rate limit (without clientSelectors) from 21 to 100 requests per hour in the test manifest.
• Rewrite the shared_no_client_selectors subtest in RateLimitGlobalMergeTest to:
  • Assert the X-Ratelimit-Limit header reports 100, 100;w=3600.
  • Warm up the route until a 200 is observed, then send 99 additional successful requests and verify that the 101st request is rate-limited with HTTP 429.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
test/e2e/tests/ratelimit.go	Refines the shared_no_client_selectors E2E subtest to explicitly validate the new 100-requests-per-hour shared limit, including header checking and precise counting of allowed vs. limited requests.
test/e2e/testdata/ratelimit-global-shared-and-unshared-header-match.yaml	Updates the gateway-level global shared rate limit rule (no clientSelectors) from 21 to 100 requests per hour to match the revised test logic.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.65%. Comparing base (a8ddb0d) to head (c674821).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8025      +/-   ##
==========================================
- Coverage   73.70%   73.65%   -0.05%     
==========================================
  Files         237      237              
  Lines       35653    35653              
==========================================
- Hits        26278    26261      -17     
- Misses       7515     7529      +14     
- Partials     1860     1863       +3     

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[zirain]

all the e2e failed, is there some problem with your changes?

[Aias00]

all the e2e failed, is there some problem with your changes?

i will check this later