fix(add): include pyproject.toml path in "already present" message

[SarthakB11]

Pull Request Check List

Resolves: #10179

• Added tests for changed code.
• Updated documentation for changed code.

The "already present in the pyproject.toml and will be skipped" notice doesn't say which pyproject.toml. With poetry self add, a poetry-managed project next to your own, or any non-cwd invocation, you have to go grep for the file.

notify_about_existing_packages now includes self.poetry.file.path in the message, styled with the same <c2> markup the add command uses elsewhere for paths. The two assertions in tests/console/commands/test_add.py were updated to interpolate the fixture's path.

[sourcery-ai]

Hey - I've left some high level feedback:

• In notify_about_existing_packages, consider avoiding the two adjacent f-strings and instead build the message as a single f-string or via .format() to improve readability and make the linter’s job easier.
• The tests interpolate app.poetry.file.path, which may be an absolute path; if the CLI output is intended to show a path relative to the current working directory, you might want to normalize it in the command code (and reflect that in the assertions) for more user-friendly output.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- In `notify_about_existing_packages`, consider avoiding the two adjacent f-strings and instead build the message as a single f-string or via `.format()` to improve readability and make the linter’s job easier.
- The tests interpolate `app.poetry.file.path`, which may be an absolute path; if the CLI output is intended to show a path relative to the current working directory, you might want to normalize it in the command code (and reflect that in the assertions) for more user-friendly output.

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