feat(translator): http2 upstream settings

[guydc]

What this PR does / why we need it:

• Exposes HTTP2 settings for upstream in Backend Traffic Policy
• Apply by default envoy's secure-by-default values for HTTP2: https://www.envoyproxy.io/docs/envoy/latest/configuration/best_practices/edge
• Adds support for the envoy override_stream_error_on_invalid_http_message option which is specifically relevant for L2 envoy deployments running http2: https://www.envoyproxy.io/docs/envoy/latest/configuration/best_practices/level_two

Which issue(s) this PR fixes: Fixes #3670, #3245 Related to #1048

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 71.95122% with 23 lines in your changes missing coverage. Please review.

Project coverage is 67.61%. Comparing base (c2c705b) to head (f8ea793). Report is 1 commits behind head on main.

Files	Patch %	Lines
internal/gatewayapi/http.go	62.16%	14 Missing :warning:
internal/gatewayapi/backendtrafficpolicy.go	50.00%	4 Missing and 2 partials :warning:
internal/xds/translator/listener.go	40.00%	2 Missing and 1 partial :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3682      +/-   ##
==========================================
+ Coverage   67.59%   67.61%   +0.01%     
==========================================
  Files         183      184       +1     
  Lines       22446    22521      +75     
==========================================
+ Hits        15173    15227      +54     
- Misses       6193     6212      +19     
- Partials     1080     1082       +2     

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[guydc]

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