router: remove route-action level header manipulation

[derekargueta]

Description: These features were deprecated in #3838 and resolves #4616
Risk Level: Low (may break anyone who is still using route-action header add/removal)
Testing: Updated - route-action configs were either removed or bumped to the route level
Docs Changes: N/A - documentation was already removed when deprecated.
Release Notes: Added

Signed-off-by: Derek Argueta dereka@pinterest.com

[derekargueta]

/retest

[repokitteh-read-only]

🙀 failed invoking rebuild of ci/circleci: release: 500 Internal Server Error

🐱

Caused by: a #6408 (comment) was created by @derekargueta.

see: more, trace.

[mattklein123]

@derekargueta do you mind merging master?

/wait

[derekargueta]

/retest

[repokitteh-read-only]

🔨 rebuilding ci/circleci: coverage (failed build)
🔨 rebuilding ci/circleci: compile_time_options (failed build)
🔨 rebuilding ci/circleci: asan (failed build)

🐱

Caused by: a #6408 (comment) was created by @derekargueta.

see: more, trace.

[derekargueta]

hmmm, //test/extensions/transport_sockets/alts:alts_integration_test failed on that last run.

[derekargueta]

/retest

[repokitteh-read-only]

🔨 rebuilding ci/circleci: compile_time_options (failed build)

🐱

Caused by: a #6408 (comment) was created by @derekargueta.

see: more, trace.

[mattklein123]

Thank you!