Recreate branch if it already exists

[iliakur]

What does this PR do?

Before

ddev release branch create

would crash if the release branch already exists. One instance where this is problematic is if we want to rerun the command after fixing GitHub token permissions

After

The same ddev command can be run a second time. It will reset the branch previously created.

Motivation

Idempotent commands ftw!

Review checklist (to be filled by reviewers)

• Feature or bugfix MUST have appropriate tests (unit, integration, e2e)
• Add the qa/skip-qa label if the PR doesn't need to be tested during QA.
• If you need to backport this PR to another branch, you can add the backport/<branch-name> label to the PR and it will automatically open a backport PR once this one is merged

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.06%. Comparing base (72690bb) to head (8951b8a).
Report is 21 commits behind head on master.

Additional details and impacted files

Flag	Coverage Δ
activemq	?
cassandra	?
ddev	87.79% <100.00%> (+0.61%)	⬆️
hive	?
hivemq	?
ignite	?
jboss_wildfly	?
kafka	?
presto	?
solr	?

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