fix(testing): migrations should look for existing target before attempting migration

[Coly010]

Current Behavior

Migrations are naively setting serve-static or preview as the target without checking if that target exists

Expected Behavior

Check if the target exists based on executor usage as a last port of call, and use the name of the target it is found on

Related Issue(s)

Closes #27439

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1 Skipped Deployment

Name	Status	Preview	Updated (UTC)
nx-dev	⬜️ Ignored (Inspect)	Visit Preview	Aug 14, 2024 6:33pm

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• nx affected --targets=lint,test,build,e2e,e2e-ci --base=c17969665c897c23824aba29ea4a01b04580e79e --head=96718eec8a1256cc974d4adfb61b176207ecd34d --parallel=3
• nx run-many -t check-imports check-commit check-lock-files check-codeowners documentation --parallel=1 --no-dte
• nx-cloud record -- nx format:check --base=c17969665c897c23824aba29ea4a01b04580e79e --head=96718eec8a1256cc974d4adfb61b176207ecd34d
• nx documentation --no-dte

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