test: separate nightly into its own job

[github-actions[bot]]

Package	Line Rate	Complexity	Health
src	87%	0	✔
src.cli	84%	0	✔
src.cli.alias	89%	0	✔
src.cli.args	96%	0	✔
src.cli.backends	95%	0	✔
src.cli.cache	95%	0	✔
src.cli.config	92%	0	✔
src.cli.direnv	80%	0	✔
src.cli.plugins	89%	0	✔
src.cli.settings	93%	0	✔
src.cli.sync	29%	0	❌
src.cli.tasks	71%	0	➖
src.config.config_file	89%	0	✔
src.config	87%	0	✔
src.forge	77%	0	✔
src.plugins.core	56%	0	➖
src.plugins	84%	0	✔
src.shell	98%	0	✔
src.toolset	85%	0	✔
src.ui	67%	0	➖
Summary	82% (13589 / 16631)	0	✔

[codacy-production[bot]]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
:white_check_mark: +0.00%	:white_check_mark: ∅

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (0aaba587b19bb57c93917bb56964e9c71c5e568d) | 16631 | 13589 | 81.71% | | | Head commit (e0fe32fb4d3d02c9df9a9ed6331141ec26aab623) | 16631 (+0) | 13589 (+0) | 81.71% (**+0.00%**) | **Coverage variation** is the difference between the coverage for the head and common ancestor commits of the pull request branch: ` - `

Diff coverage details

| | Coverable lines | Covered lines | Diff coverage | | ------------- | ------------- | ------------- | ------------- | | Pull request (#2145) | 0 | 0 | **∅ (not applicable)** | **Diff coverage** is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: `/ * 100%`

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_{Codacy will stop sending the deprecated coverage status from June 5th, 2024. Learn more}