Update of all variant files to add BAT_VOLT_PIN for all variants that define a battery voltage pin

[mitra42]

Closes #11953

Description of Change

Variant files define the battery voltage pin in at least 15 different ways, this makes it impossible to write library code that works with the battery across multiple boards without a VERY long ifdef which (since existing variant files define const uint8_t) can only test against board names.

Adding this #define allows for board and variant independent battery code for all boards that define a battery pin.

Note - name of pin BAT_VOLT_PIN as suggested by @me-no-dev

Test Scenarios

Please describe on what Hardware and Software combinations you have tested this Pull Request and how.

I have tested on lilygo_t3_s3 using the variant lilygo_t3_s3_sx127x, changing a battery sensor to use this new #define.

Related links

Please provide links to related issue, PRs etc.
Closes #11953

[github-actions]

Warnings

⚠️

Some issues found for the commit messages in this PR: the commit message "Add BAT_VOLT_PIN for all variants that define a battery voltage pin with any obviously discoverable name.": summary should not end with a period (full stop) 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).

👋 Hello mitra42, we appreciate your contribution to this project!

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[me-no-dev]

@P-R-O-C-H-Y one more thing to keep track of

[mitra42]

Thanks