Handle rules for deleted branches

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The old flow for protected branches allowed to:

• protect a branch that does not yet exist
• display a protection rule for a branch that has been deleted

Giving the nature of the new flow, we should mark the rule for a non-existing branch both on the list of branch rules and on the details page.

We should handle creating a wildcard rule from a given string, if a branch of that name does not yet exist (see the screenshots below).

Old flow for protecting a branch

protect a branch that does not yet exist

step	screenshot
entering a name of a branch that doesn't exist prompts to set a wildcard of that exact string
a protection rule is displayed with a note

display a protection rule for a branch that has been deleted

step	screenshot
creating a rule for logs branch that exists at this point
[on Branches listing] deleting the branch
[on Branches listing] confirming the action
a protection rule is displayed with a note