Wait for some time between creating the release PR and searching for it

[jcouball]

To output the link to the release PR, this gem searches for the PR number for the PR for the release branch as follows:

gh pr list --search "head:#{release_branch}" --json number --jq ".[].number

A problem was found that this was returning an empty string if called too quickly after creating the PR. Perhaps GitHub has eventual consistency or is indexing the result.

This PR makes a change to TRY to get the PR number up to 10 times sleeping 0.5 seconds between each attempt until a non-empty string is returned.

Note that Project#release_pr_number maps the empty string to a nil so the implementation is waiting for this method to return a non-nil.

[codeclimate]

Code Climate has analyzed commit f2ca7c5 and detected 0 issues on this pull request.

The test coverage on the diff in this pull request is 100.0% (50% is the threshold).

This pull request will bring the total coverage in the repository to 100.0% (0.0% change).

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