Remove Resource::expr_to_string() #10191

Job	Run time
markdown_lint	4s
Typos Check	5s
Lints and doc tests on ubuntu-latest	11m 11s
Lints and doc tests on windows-latest	16m 38s
Unit tests on ubuntu-latest	24m 39s
Lints and doc tests on macos-13	11m 35s
Unit tests on windows-latest	32m 21s
Lints and doc tests on macos-14	6m 39s
Unit tests on macos-13	21m 0s
Unit tests on macos-14	13m 20s
Memory leak checks	2m 17s
CI status checks	1s
	2h 19m 50s

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