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

…rom MDS (#1844)

* fix: Simplify call to directly retrieve the default service account from MDS

* chore: Make getDefaultServiceAccountUrl package-private

* build: add protobuf-4.x-rc configuration to release please

* chore: enable manifest option in release configuration

* chore: migrate tests from JUnit 4 to JUnit 5

* fix: move @test annotations to separate lines

* chore: Fix JUnit annotations being on the same line

* chore: Add junit ignore deps for dependency plugin

* chore: Fix samples imports to use new junit and truth

* chore: Fix invalid test

* chore: Address some sonatype code smells

* chore: Fix lint issues

* chore: Remove unnecessary old junit profile

* chore: Add junit5 platform runner

* chore: Add junit4 test dep back

* chore: Add junit4 to ignore in dependency check

* chore: Add junit4 to ignore in dependency check

* chore: Add junit4 tests to CAB module

* chore: Remove hamcrest dependency

* chore: Revert Junit5 changes in samples directory

* chore: Revert Junit5 changes in samples directory

* chore: Remove end of file whitespace

* chore: Remove whitespace

* chore: cleanup release-please config

- Remove redundant options already declared at the top level.

- Remove bumpMinorPreMajor for repositories after the first major release.

* chore: format release-please.yml

* chore: add gencode

* update protobuf version

* update package path in gencode

* code format

* skip clirr

* update http version

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