fix(coverage): global coverage includes files in glob pattern coverage rules (fix #6165)

[thor-juhasz]

Description

Fixes #6165.

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[AriPerkkio]

I've adjusted these now so that following error is shown when the fix is reverted.

----------|---------|----------|---------|---------|-------------------
File      | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s 
----------|---------|----------|---------|---------|-------------------
All files |   66.66 |      100 |      50 |   66.66 |                   
 even.ts  |     100 |      100 |     100 |     100 |                   
 math.ts  |      50 |      100 |      25 |      50 | 6-7,10-11,14-15   
----------|---------|----------|---------|---------|-------------------
FAIL  |v8| test/threshold-glob.test.ts > threshold glob patterns count in global coverage
Error: ERROR: Coverage for lines (50%) does not meet global threshold (66%)
ERROR: Coverage for functions (25%) does not meet global threshold (50%)
ERROR: Coverage for statements (50%) does not meet global threshold (66%)


----------|---------|----------|---------|---------|-------------------
File      | % Stmts | % Branch | % Funcs | % Lines | Uncovered Line #s 
----------|---------|----------|---------|---------|-------------------
All files |      50 |      100 |      50 |      50 |                   
 even.ts  |     100 |      100 |     100 |     100 |                   
 math.ts  |      25 |      100 |      25 |      25 | 6-14              
----------|---------|----------|---------|---------|-------------------
FAIL  |istanbul| test/threshold-glob.test.ts > threshold glob patterns count in global coverage
Error: ERROR: Coverage for lines (25%) does not meet global threshold (50%)
ERROR: Coverage for functions (25%) does not meet global threshold (50%)
ERROR: Coverage for statements (25%) does not meet global threshold (50%)

[AriPerkkio]

Awesome, thanks! 🙌

I'll review the follow-up feature #6174 soon.