[release/8.0] Fix ResponseCompressionMiddleware tests

[wtgodbe]

Compression size is no longer guaranteed on Fedora41, so instead check that the size is within a reasonable range (+/- 5)

Fixes #59870

Pull Request Overview

This PR updates the ResponseCompressionMiddleware tests to account for Fedora41's variable compression sizes by checking that the body length is within a reasonable range.

• Modified test to use an in-range assertion for ContentLength
• Retains the original equality assertion which may lead to conflicting behavior

Comments suppressed due to low confidence (1)

src/Middleware/ResponseCompression/test/ResponseCompressionMiddlewareTest.cs:1327

• The equality assertion conflicts with the new in-range assertion. Consider removing or updating this equality check to avoid failure on Fedora41 where the compression size may vary.

Assert.Equal(expectedBodyLength, response.Content.Headers.ContentLength);

[dotnet-policy-service]

Hi @wtgodbe. If this is not a tell-mode PR, please make sure to follow the instructions laid out in the servicing process document.
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[wtgodbe]

https://dev.azure.com/dnceng-public/public/_build/results?buildId=976454&view=results

[dotnet-policy-service]

Looks like this PR hasn't been active for some time and the codebase could have been changed in the meantime.
To make sure no conflicting changes have occurred, please rerun validation before merging. You can do this by leaving an /azp run comment here (requires commit rights), or by simply closing and reopening.