Idempotency

[dylan-smith]

Make all commands idempotent so that if you call it more than once it will not fail. For example, create-team should check if the team already exists and if so show a warning (today it will just crash)

• [x] AddTeamToRepoCommand - This command is already Idempotent
• [x] #260
• [x] #268
• [x] #287
• [x] GenerateScriptCommand
• [x] GrantMigratorRoleCommand - This command is already Idempotent
• [ ] IntegrateBoardsCommand
• [x] LockRepoCommand - This command is already Idempotent
• [x] #333
• [x] RevokeMigratorRoleCommand - This command is already Idempotent
• [ ] RewirePipelineCommand
• [x] #441