feat: warn when a flow is deleted #903

Job	Run time
npm-lint	1m 3s
commit-lint	1m 21s
pull-request-lint	2s
megalinter	1m 35s
build / source	2m 0s
publish-dev	1m 22s
e2e-check / e2e-test (macos-latest, 18, sfdx-cli)	56s
e2e-check / e2e-test (macos-latest, 18, @salesforce/cli)	46s
e2e-check / e2e-test (macos-latest, 20, sfdx-cli)	51s
e2e-check / e2e-test (macos-latest, 20, @salesforce/cli)	46s
e2e-check / e2e-test (windows-latest, 18, sfdx-cli)	1m 36s
e2e-check / e2e-test (windows-latest, 18, @salesforce/cli)	1m 37s
e2e-check / e2e-test (windows-latest, 20, sfdx-cli)	1m 33s
e2e-check / e2e-test (windows-latest, 20, @salesforce/cli)	1m 34s
e2e-check / e2e-test (ubuntu-latest, 18, sfdx-cli)	50s
e2e-check / e2e-test (ubuntu-latest, 18, @salesforce/cli)	40s
e2e-check / e2e-test (ubuntu-latest, 20, sfdx-cli)	1m 12s
e2e-check / e2e-test (ubuntu-latest, 20, @salesforce/cli)	42s
	20m 26s

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