Fix ci_tests.yaml to actually run full tests on Wednesday

[weiji14]

Description of proposed changes

Previous expression was matching too strictly on the crontab, so using endsWith instead. xref https://docs.github.com/en/actions/learn-github-actions/expressions#endswith. Inspired by https://github.com/orgs/community/discussions/25662#discussioncomment-3248648.

Cherry-picked from 0bf561f and 21cfbff in #2283

Patches #1833. Fixes #2286.

Reminders

• Run make format and make check to make sure the code follows the style guide.
• Add tests for new features or tests that would have caught the bug that you're fixing.
• Add new public functions/methods/classes to doc/api/index.rst.
• Write detailed docstrings for all functions/methods.
• If wrapping a new module, open a 'Wrap new GMT module' issue and submit reasonably-sized PRs.
• If adding new functionality, add an example to docstrings or tutorials.
• Use underscores (not hyphens) in names of Python files and directories.

Slash Commands

You can write slash commands (/command) in the first line of a comment to perform
specific operations. Supported slash commands are:

• /format: automatically format and lint the code
• /test-gmt-dev: run full tests on the latest GMT development version

[seisman]

Can't verify if it works but at least it looks good.

[weiji14]

Can't verify if it works but at least it looks good.

Well, we'll find out next Wednesday 🤞