Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>

…uld be flushed (#1790)

* ci: add showcase-clirr check

* chore: eliminate showcase version assumption

* chore: use target-branch showcase version for comparison

* chore: initial additions to handle GDC-H API audience

* chore: add unit tests for GDC-H

* chore: cleanup of logic

* chore: decompose tests into separate methods

* chore: fix clirr diff check

* chore: fmt:format

* chore: add support in `ClientSettings`

* chore: add showcase IT for GDCH credentials

* chore: comments

* chore: improve tests

* chore: add partial IT for testing context credential

* chore: recreate GdchCredentials with audience using convenience method

* chore: more readable api audience logic

* chore: no wildcard imports

* chore: javadoc for public methods

* chore: gdch test to use default null initialization

* chore: tear down for gdch IT

* chore: `assertThrows` for gdch ITs

* chore: mvn fmt:format

* test: remove context test

* docs: explain that audience will be overriden if set through client/stub settings

* test: test audience setting should modify initial credentials

* chore: clirr check

* chore: ignore gdch changes

* chore: format

* chore: default to endpoint if audience not provided

* test: refresh gdch creds to confirm audience works

* chore: fmt

* chore: fmt

* chore: better test names in ClientContextTest

* chore: better test names for showcase tests

* chore: simplify refresh verification logic

* chore: include outcome in gdch it test names

* chore: expand comments in GDCH ITs

* test: intercept mock transport to verify audience

* chore: fmt

* chore: move auth test-jar to shared dependencies

* chore: cleanup

* chore: use inferred version for auth library

* deps: update google-auth-java-library to 1.19.0

* choreL fmt ITGdch.java

* chore: import auth test-jar using common version variable

* chore: remove auth test-jar import from first-party-dependencies

* chore: add license headers to new files

* chore: revert google-auth-version to be obtained from main branch

* chore: correct showcase parent pom indentation

* chore: remove resource declaration for native test build

…ty in LRO parsing (#1726)

* chore: Bump guava version to 32.1.1-jre

* chore: Add guava to gradle template

Install sdk-platform-java before performing final clirr check, so version changes are available in the local repository

Co-authored-by: release-please[bot] <55107282+release-please[bot]@users.noreply.github.com>