fix: improve error message for missing plugins

[github-actions[bot]]

Package	Line Rate	Complexity	Health
src.backend	69%	0	➖
src	86%	0	✔
src.cli	83%	0	✔
src.cli.alias	89%	0	✔
src.cli.args	97%	0	✔
src.cli.backends	95%	0	✔
src.cli.cache	95%	0	✔
src.cli.config	92%	0	✔
src.cli.direnv	80%	0	✔
src.cli.generate	87%	0	✔
src.cli.plugins	86%	0	✔
src.cli.settings	93%	0	✔
src.cli.sync	27%	0	❌
src.cli.tasks	71%	0	➖
src.config.config_file	89%	0	✔
src.config	87%	0	✔
src.plugins	90%	0	✔
src.plugins.core	56%	0	➖
src.shell	98%	0	✔
src.toolset	86%	0	✔
src.ui	63%	0	➖
Summary	80% (13655 / 17011)	0	✔

[codacy-production[bot]]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
:white_check_mark: -0.03%	:white_check_mark: 61.54%

Coverage variation details

| | Coverable lines | Covered lines | Coverage | | ------------- | ------------- | ------------- | ------------- | | Common ancestor commit (63739c880dbfefdecab282736710d496d7e88dbc) | 17008 | 13658 | 80.30% | | | Head commit (5c0741f0ae4c7068cf84bd631861d9fa9a729fd6) | 17011 (+3) | 13655 (-3) | 80.27% (**-0.03%**) | **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 (#2313) | 13 | 8 | **61.54%** | **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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