fix: bring back pre-Sentry release process workflows

[calvin-codecov]

Based on c3ab689#diff-71aadfdc5a8f9263f24650c0cad00c73726af866ac2fa32f30a213a0a149ca80

• Bringing back older release process of release_flow.yml that was used pre-Sentry prevent-cli and removing the adopted .craft.yml and build.yml files. Current workflow in release-codecov-cli.yml expects assets to exist but does not upload them so adding it back into build_assets.yml. release-codecov-cli.yml -> release_flow.yml
• Updates actions/checkout to pinned version of v7.0.0.
• Adds back create_release_pr workflow to help kickoff release process.

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
723	1	722	1

View the full list of 1 ❄️ flaky test(s)

api.temp.calculator.test_calculator::test_divide

Flake rate in main: 100.00% (Passed 0 times, Failed 562 times)

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