[DNM] Add more FailPoints in critical code paths

[yibin87]

What problem does this PR solve?

Issue Number: close #4807

Problem Summary:

What is changed and how it works?

Check List

Tests

• Unit test
• [ x ] Integration test
• Manual test (add detailed scripts or steps below)
• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

None

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[JaySon-Huang]

Maybe you should declare these two failpoints in APPLY_FOR_FAILPOINTS, otherwise you can not get them enabled by using FailPointHelper::enableFailPoint

tiflash/dbms/src/Common/FailPoint.cpp

Lines 142 to 156 in efd4557

	#define SUB_M(NAME, flags) \
	if (fail_point_name == FailPoints::NAME) \
	{ \
	/* FIU_ONETIME -- Only fail once; the point of failure will be automatically disabled afterwards.*/ \
	fiu_enable(FailPoints::NAME, 1, nullptr, flags); \
	return; \
	}
	#define M(NAME) SUB_M(NAME, FIU_ONETIME)
	APPLY_FOR_FAILPOINTS_ONCE(M)
	#undef M
	#define M(NAME) SUB_M(NAME, 0)
	APPLY_FOR_FAILPOINTS(M)
	#undef M
	#undef SUB_M

[yibin87]

Yeah，I planned to enable these random failpoints by fiu-run and fiu-ctl, like fiu-run -x -c 'enable_random name=random_tunnel_failpoints,probability=0.01' tiflash xxx, in big-cluster test to see if tiflash handled correctly(don't crash and no resource leak), not used by gtest.
Now, I'll add it to be used by gtest also.

[yibin87]

Some unexpected changes merged into this PR, closed it now.