Tests

Implement head resizing (and reversal) for larrow/rarrow/darrow #29530

Job	Run time
Python 3.11 on ubuntu-22.04	10m 32s
Python 3.12 on ubuntu-24.04	10m 32s
Python 3.11 on macos-13	10m 43s
Python 3.11 on ubuntu-22.04 (Minimum Versions)	10m 30s
Python 3.12 on ubuntu-22.04-arm	10m 27s
Python 3.13t on ubuntu-22.04 Free-threaded	10m 32s
Python 3.13 on ubuntu-22.04 (Extra TeX packages)	10m 33s
Python 3.13 on macos-14	10m 38s
Python 3.12 on macos-14	10m 40s
Create issue on failure	1s
	1h 35m 8s

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