prepping for release 1.20.4 (#22179)

Backport of retracting api submodule version 1.31.1 into release/1.20…

….x (#22173)

* backport of commit e617c17

* backport of commit 5dda3c2

* backport of commit 8d410c2

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Co-authored-by: nitin.sachdev <[email protected]>

Stage 1.20.3 (#22154)

Added changelog and version for releasing 1.20.3

changelog for 1.19.5

changelog for consul-enterprise 1.18.8

Update troubleshoot

Backport of security: Suppress redhat linux CVEs into release/1.20.x (#…

…22148)

Backport of security: Suppress redhat linux CVEs into release/1.20.x (#…

…22148)

Update envoyextensions

changelog for 1.15.18