1.3.x branch cut, version bump PR

Upmerge 1.2.4 into master

Add check that we don't schedule the same closure twice at once.

Use RESOURCE_EXHAUSTED for max message size limits.

Making sure that gpr_free is a no-op for NULL input.

Fix typo in Kokoro scripts

Ubsan fixes

Fix 1MB perf scenarios

remove src/csharp/global.json

Add individual sanitizer suites to Kokoro

Add helper function to supply and parse error_details from Status.

Revert "Implement lazy deframe"

Bump version to 1.2.4

Update VM creation scripts to update Linux kernel

True Binary Encoding

Manual upmerge from v1.2.x

Implement lazy deframe

Send `content-type` header on trailer-only responses

Restore cronet tests

Fixes for bm_diff

Fix soname version mismatch in Makefile

Node server shutdown improvements