feat(config/toml): support jinja templates in toml files

[jiaweikho]

Changes

• Massage toml content before parsing by removing jinja delimiters according to the specification: jinja
• Add removeTemplate option to the parseToml function
• Add removeTemplate: true config to poetry and pep621 pyproject.toml parsers.

Context

This addresses the feature request raised in #33105 by applying a similar method in the yaml parser in #26682.

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• Newly added/modified unit tests, or
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• Both unit tests + ran on a real repository

[jiaweikho]

@viceice thanks for the review. I haven't documented this new functionality yet. Do you think I should add a note in the poetry/pep621 docs about jinja templates?

[jiaweikho]

@viceice I've added tests for the pep621 and poetry managers based on the CI coverage feedback. I've tried my best to follow the precedent but the style of extract.spec.ts in pep621 and poetry are quite different so you may notice some style differences between them.