Fix //test/common/websocket:codec_test on big endian

[namrata-ibm]

Commit Message: Additional Description: As length is set using memcpy and further processed as per LE format, the test fails on s390x(big endian). Risk Level: Testing: Docs Changes: Release Notes: Platform Specific Features: [Optional Runtime guard:] [Optional Fixes #Issue] [Optional Fixes commit #PR or SHA] [Optional Deprecated:] [Optional API Considerations:]

[repokitteh-read-only[bot]]

Hi @namrata-ibm, welcome and thank you for your contribution.

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:cat:

Caused by: https://github.com/envoyproxy/envoy/pull/34443 was opened by namrata-ibm.

see: more, trace.

[namrata-ibm]

Thank you for reviewing @alyssawilk