Revert "assign highmem runner to beam_PostCommit_Python and to beam_P…

…reCommit_Java_GCP_IO_Direct (apache#28719)" (apache#28804)

This reverts commit a4ee854.

[BEAM-9547] Add indexing tests (apache#12856)

Tag for 2.24.0 release.

[Gradle Release Plugin] - creating tag: 'v2.24.0-RC3'.

[Gradle Release Plugin] - creating tag: 'v2.24.0-RC2'.