fix(gitignore): add .gitignore to themePropertyTables directory

[ImCoolNowRight]

Description

Adds a .gitignore to the themePropertyTables directory to ensure that the directory always exists, but files within it continue to be ignored.

The error, up until now, was that the directory did not exist by the time the runner attempted to write the files.

References

LUI-849

Testing

Will have to check to make sure that Actions no longer fail when trying to write color.md.

Automation

N/A

Checklist

• all commented code has been removed
• any new console issues have been resolved
• code linter and formatter has been run
• test coverage meets repo requirements
• PR name matches the expected semantic-commit syntax

[svc-lightning-ui-components]

Test Execution Failed.

[joshhowenstine]

This should totally work I think. However, as an alternative we could also change line 235 to be synchronous? Honestly, ether approach is fine with me.

try { fs.mkdirSync(mdFile.substring(0, mdFile.lastIndexOf('/')), { recursive: true }); } catch (err) { if (err.code !== 'EEXIST') { throw err; } }

[svc-lightning-ui-components]

Test Execution Failed.

[ImCoolNowRight]

This should totally work I think. However, as an alternative we could also change line 235 to be synchronous? Honestly, ether approach is fine with me.

try { fs.mkdirSync(mdFile.substring(0, mdFile.lastIndexOf('/')), { recursive: true }); } catch (err) { if (err.code !== 'EEXIST') { throw err; } }

I tried this yesterday on the IS repo. It worked fine for me locally, but continued to run into the same error on GitHub. I like keeping this (almost) empty directory around, since we know we'll always need it to exist.

[svc-lightning-ui-components]

Test Execution Failed.

[svc-lightning-ui-components]

Test Execution Passed.