[Feature] Overwrite response 304 when etag not match

[wcchang1115]

PR checklist

• Ensure you have added or ran the appropriate tests for your PR.
• DCO signed

What type of PR is this?
Feature

What this PR does / why we need it:

• Instead of disable cache with no-store, we overwrite the 304 response when the etag is not matched.

Which issue(s) this PR fixes:
DRC-995

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 9 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
recce/server.py	0.00%	9 Missing ⚠️

Files with missing lines	Coverage Δ
recce/server.py	51.11% <0.00%> (-1.35%)	⬇️

... and 6 files with indirect coverage changes

[wcchang1115]

After discussion, we prefer not to overwrite the cache behavior.
Just use no-store to disable cache.