forge--completing-read: Remove function #585

Job	Run time
Compile / Get matrix	5m 43s
Compile / Compile using Emacs 29.4	1m 45s
Compile / Compile using Emacs 30.1	4m 59s
Compile / Compile using Emacs release-snapshot	1m 9s
Compile / Compile using Emacs snapshot	1m 0s
Compile / Compile using Emacs 29.1	1m 7s
	15m 43s

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