Change GitHub Actions jobs to use reusable workflows

[douglatornell]

re: issue #14

Reusable workflows are in UBC-MOAD/gha-workflows

• [x] Add .github/dependabot.yaml to check for action version updated and generate PRs
• [x] Subscribe to repo workflows on Slack #ssc-repos channel /github subscribe SS-Atlantis/AtlantisCmd workflows:{event:"pull_request","push" branch:"main"}
• [x] Add ~editable~ VCS installs of SalishSeaCast and MOAD pkgs to environment-test.yaml
• [x] Update codeql-analysis.yaml
• [x] Update and rename docs-linkcheck.yaml
• [x] Update and rename pytest-coverage.yaml
• [x] Confirm badge URLs in README and dev docs
• [x] ~Delete repo secrets in favour of org secrets~ N/A for this repo

[codecov[bot]]

Codecov Report

Base: 93.75% // Head: 93.75% // No change to project coverage :thumbsup:

Coverage data is based on head (7ada427) compared to base (0574da1). Patch has no changes to coverable lines.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #17 +/- ## ======================================= Coverage 93.75% 93.75% ======================================= Files 7 7 Lines 432 432 Branches 21 21 ======================================= Hits 405 405 Misses 24 24 Partials 3 3 ``` | Flag | Coverage Δ | | |---|---|---| | unittests | `93.75% <ø> (ø)` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SS-Atlantis#carryforward-flags-in-the-pull-request-comment) to find out more. Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SS-Atlantis). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=SS-Atlantis)

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