docs: Fix release notes for v1.15.1 release. (envoyproxy#13318)

Signed-off-by: Antonio Vicente <[email protected]>

release: cutting 1.15.1 (envoyproxy#217)

Signed-off-by: Antonio Vicente <[email protected]>

release: cutting 1.14.5 (envoyproxy#221)

Signed-off-by: Antonio Vicente <[email protected]>

backport to v1.13: test flake: fix flake in ApiListener integration t…

…est (envoyproxy#9808) (envoyproxy#13316)

Description: previously the test was not waiting for the expectation on the server's thread to complete. Therefore, there was a use after free race condition with the ApiListener's TlsCachingDateProvider. This PR makes it so that the test waits for the expectation to be fulfilled  and thus prevents the race.
Risk Level: low
Testing: ran integration test a few thousand times locally on a linux machine.

Signed-off-by: Jose Nino <[email protected]>
Signed-off-by: Antonio Vicente <[email protected]>

release: cutting 1.13.5 (envoyproxy#219)

Signed-off-by: Antonio Vicente <[email protected]>

release: cutting 1.12.7 (envoyproxy#220)

Signed-off-by: Antonio Vicente <[email protected]>

release: cutting 1.15 (envoyproxy#11898)

Risk Level: n/a
Testing: n/a
Docs Changes: yes
Release Notes: exactly
Signed-off-by: Alyssa Wilk <[email protected]>

tls: improve wildcard matching (envoyproxy#11921) (envoyproxy#11929)

Patching in 11885 with runtime guards and release notes

Risk Level: Medium (changes to cert matching)
Testing: new unit test
Docs Changes: n/a
Release Notes: inline
Runtime guard: envoy.reloadable_features.fix_wildcard_matching

Signed-off-by: Yann Soubeyrand <[email protected]>
Signed-off-by: Alyssa Wilk <[email protected]>
Signed-off-by: Piotr Sikora <[email protected]>

tls: improve wildcard matching (envoyproxy#11921) (envoyproxy#11928)

Patching in 11885 with runtime guards and release notes

Risk Level: Medium (changes to cert matching)
Testing: new unit test
Docs Changes: n/a
Release Notes: inline
Runtime guard: envoy.reloadable_features.fix_wildcard_matching

Signed-off-by: Yann Soubeyrand <[email protected]>
Signed-off-by: Alyssa Wilk <[email protected]>
Signed-off-by: Piotr Sikora <[email protected]>

tls: improve wildcard matching (envoyproxy#11921) (envoyproxy#11927)

Patching in 11885 with runtime guards and release notes

Risk Level: Medium (changes to cert matching)
Testing: new unit test
Docs Changes: n/a
Release Notes: inline
Runtime guard: envoy.reloadable_features.fix_wildcard_matching

Signed-off-by: Yann Soubeyrand <[email protected]>
Signed-off-by: Alyssa Wilk <[email protected]>
Signed-off-by: Piotr Sikora <[email protected]>