fix: handle merge_group github events

[joseph-sentry]

if we get a branch with gh-readonly-queue, it comes from a merge queue and the actual branch name is located in the middle

[codecov]

❌ 5 Tests Failed:

Tests completed	Failed	Passed	Skipped
3440	5	3435	5

View the top 3 failed test(s) by shortest run time

api.temp.calculator.test_calculator::test_divide

Stack Traces | 0.001s run time

def
                test_divide():
                > assert Calculator.divide(1, 2) == 0.5
                E assert 1.0 == 0.5
                E + where 1.0 = <function Calculator.divide at 0x104c9eb90>(1, 2)
                E + where <function Calculator.divide at 0x104c9eb90> = Calculator.divide
                .../temp/calculator/test_calculator.py:30: AssertionError

api.temp.calculator.test_calculator::test_divide

Stack Traces | 0.001s run time

def
                test_divide():
                > assert Calculator.divide(1, 2) == 0.5
                E assert 1.0 == 0.5
                E + where 1.0 = <function Calculator.divide at 0x104c9eb90>(1, 2)
                E + where <function Calculator.divide at 0x104c9eb90> = Calculator.divide
                .../temp/calculator/test_calculator.py:30: AssertionError

api.temp.calculator.test_calculator::test_divide

Stack Traces | 0.001s run time

def
                test_divide():
                > assert Calculator.divide(1, 2) == 0.5
                E assert 1.0 == 0.5
                E + where 1.0 = <function Calculator.divide at 0x104c9eb90>(1, 2)
                E + where <function Calculator.divide at 0x104c9eb90> = Calculator.divide
                .../temp/calculator/test_calculator.py:30: AssertionError

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[github-actions]

✅ All tests successful. No failed tests were found.

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[thomasrockhu-codecov]

logic is sound

[thomasrockhu-codecov]

for clarity can we do

Suggested change

	if branch and branch.startswith("gh-readonly-queue/"):
	return branch.split("/")[1]
	if branch:
	branch = branch.split("/")[1] if branch.startswith("gh-readonly-queue/") else branch
	return branch

[thomasrockhu-codecov]

my worry here is if we depend on None to be meaningful versus ''. Previous logic doesn't account for empty string

[thomasrockhu-codecov]

@joseph-sentry this looks good, can we move it to prevent-cli though?