add Chip variant to pioarduino-build.py

[Jason2866]

to support different chip variants (like p4 rev pre300 and post300)

@me-no-dev

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[github-actions]

Warnings

⚠️

Some issues found for the commit messages in this PR: the commit message "Fix chip_variant retrieval with default value": summary looks empty type/action looks empty the commit message "Refactor build_mcu and chip_variant assignment logic": summary looks empty type/action looks empty the commit message "add chip_variant to pioarduino-build.py": summary looks empty type/action looks empty Please fix these commit messages - here are some basic tips: follow Conventional Commits style correct format of commit message should be: <type/action>(<scope/component>): <summary>, for example fix(esp32): Fixed startup timeout issue allowed types are: change,ci,docs,feat,fix,refactor,remove,revert,test sufficiently descriptive message summary should be between 10 to 72 characters and start with upper case letter avoid Jira references in commit messages (unavailable/irrelevant for our customers) TIP: Install pre-commit hooks and run this check when committing (uses the Conventional Precommit Linter).

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[Jason2866]

hold on, there can happen an error

[Jason2866]

Possible error fixed. Now it is good for merge