feat: warn when a flow is deleted #908

Job	Run time
pull-request-lint	2s
megalinter	1m 27s
commit-lint	1m 16s
npm-lint	1m 9s
build / source	2m 14s
publish-dev	1m 23s
e2e-check / e2e-test (macos-latest, 18, sfdx-cli)	1m 10s
e2e-check / e2e-test (macos-latest, 18, @salesforce/cli)	52s
e2e-check / e2e-test (macos-latest, 20, sfdx-cli)	1m 17s
e2e-check / e2e-test (macos-latest, 20, @salesforce/cli)	59s
e2e-check / e2e-test (windows-latest, 18, sfdx-cli)	4m 55s
e2e-check / e2e-test (windows-latest, 18, @salesforce/cli)	4m 33s
e2e-check / e2e-test (windows-latest, 20, sfdx-cli)	3m 52s
e2e-check / e2e-test (windows-latest, 20, @salesforce/cli)	4m 43s
e2e-check / e2e-test (ubuntu-latest, 18, sfdx-cli)	49s
e2e-check / e2e-test (ubuntu-latest, 18, @salesforce/cli)	39s
e2e-check / e2e-test (ubuntu-latest, 20, sfdx-cli)	43s
e2e-check / e2e-test (ubuntu-latest, 20, @salesforce/cli)	37s
	32m 40s

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