trying to fix some sanity

nope that didn't work

fixing test failiures

added debug code

more trail and error

more trial and error

cleaning debug code

2. Added support for mock.
3. Sanity fix.

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"

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