[babel 7] Allow setting `ignoreExtensions` in Flow preset #10827

Job	Run time
Build Babel Artifacts on Windows	1m 49s
Prepare Cache	22s
test262 - Prepare for running in parallel	34s
Test on Node.js Latest	2m 52s
Test ESM version	2m 10s
Build Babel 8 Artifacts	2m 44s
Build Babel Artifacts	1m 17s
Validate Yarn dependencies and constraints	26s
Lint	2m 4s
Test on Node.js (20)	1m 34s
Test @babel/eslint-* with ESLint 7.5.0	32s
Third-party Parser Tests	1m 34s
Test on Node.js (18)	1m 45s
Test @babel/runtime integrations	1m 18s
Test on Node.js (16)	1m 46s
Test on Node.js (14)	1m 45s
test262 (0)	10m 29s
Test on Node.js (12)	2m 0s
test262 (1)	6m 55s
Test on (windows-latest)	2m 20s
Test on Node.js (10)	3m 2s
test262 (2)	8m 4s
Test on (macos-latest)	2m 8s
Test on Node.js (8)	3m 44s
test262 (3)	6m 46s
Test on Node.js (6)	4m 52s
test262 (4)	7m 58s
test262 (5)	7m 37s
test262 (6)	8m 0s
test262 (7)	5m 45s
Test Babel 8 breaking changes on (ubuntu-latest)	2m 3s
Test Babel 8 breaking changes on (windows-latest)	3m 1s
Test Babel 8 breaking changes on (macos-latest)	3m 11s
test262 - Analyze results	1m 11s
	1h 53m 38s

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