[JSInterp, YouTube] Support YT player `b22ef6e7` etc #2978

Job	Run time
Linter	15s
Select tests from inputs	1s
Run tests (ubuntu-20.04, 2.7, cpython, core, sh)	1m 6s
Run tests (ubuntu-20.04, 3.2, cpython, core, sh)	1m 9s
Run tests (ubuntu-20.04, 3.5, cpython, core, sh)	1m 11s
Run tests (ubuntu-20.04, 3.9, cpython, core, sh)	1m 3s
Run tests (ubuntu-20.04, 3.11, cpython, core, sh)	1m 4s
Run tests (ubuntu-20.04, pypy-2.7, cpython, core, sh)	2m 15s
Run tests (ubuntu-20.04, pypy-3.6, cpython, core, sh)	2m 34s
Run tests (ubuntu-20.04, pypy-3.7, cpython, core, sh)	2m 42s
Run tests (windows-2019, 3.4, cpython, core, bat)	2m 11s
Run tests (windows-2019, 3.4, cpython, nodownload, bat)	1m 14s
Run tests (ubuntu-20.04, 2.7, jython, core, sh)	3m 6s
Run tests (ubuntu-20.04, 2.7, jython, nodownload, sh)	25s
	20m 16s

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