Fix Integration test failures for Big endian on GA CI

[sangitanalkar]

What's the problem this PR addresses?

Fixes the GA CI Integration jobs failing for Big endian.

How did you fix it?

1. Changed the Ubuntu image to Ubuntu 22.04 for Big Endian jobs as it fixes the test case failures.
   Also Ubuntu 20.04 is EOL in April 2025
2. Increased TEST_TIMEOUT for Big Endian to fix the following TC failing due to timeout issue:
   pkg-tests-specs/sources/commands/constraints/fix.test.js

Checklist

• I have read the Contributing Guide.

• I have set the packages that need to be released for my changes to be effective.

• I will check that all automated PR checks pass before the PR gets reviewed.