use non-cancellable pause helper everywhere

[Guest0x0]

• rename @coroutine.pause_after_io to @coroutine.pause_nocancel to better reflect its semantic
• replace @coroutine.protect_from_cancel(() => @coroutine.pause()) with @coroutine.pause_nocancel in the whole code base

[coveralls]

Coverage Report for CI Build 1185

Coverage remained the same at 77.959%

Details

• Coverage remained the same as the base build.
• Patch coverage: 1 uncovered change across 1 file (16 of 17 lines covered, 94.12%).
• No coverage regressions found.

Uncovered Changes

File	Changed	Covered	%
src/internal/event_loop/fs.mbt	1	0	0.0%
Total (6 files)	17	16	94.12%

Coverage Regressions

No coverage regressions found.

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Coverage Stats

Relevant Lines:	5390
Covered Lines:	4202
Line Coverage:	77.96%
Coverage Strength:	11164.14 hits per line

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💛 - Coveralls