Tatsh / deltona

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commands.git: pluralise remaining pull request count properly

The per-repository status line printed by `_run_bot_merge_with_retry`
during the retry loop used the placeholder form `pull request(s)`,
which reads as machine-generated. Branch on the count and emit either
`1 pull request` (singular) or `N pull requests` (plural for any
other count) so the message reads naturally.

Update the four existing assertions in `tests/test_git_commands.py`
that exercised both code paths (the failure fixture maps
`tatsh/alpha: 2` and `tatsh/beta: 1`, which now read as `2 pull
requests` and `1 pull request` respectively). Both branches of the
new conditional are covered; `deltona/commands/git.py` stays at 100%
coverage.

Signed-off-by: Andrew Udvare <audvare@gmail.com>

400 of 400 branches covered (100.0%)

Branch coverage included in aggregate %.

2 of 2 new or added lines in 1 file covered. (100.0%)

3349 of 3349 relevant lines covered (100.0%)

5.0 hits per line