[code-infra] The parser of the describe conformance consider `skip` but not `only` config

[alexfauquette]

Found while reviewing mui/mui-x#13647

If you use the describeConformance(..., () => ({ only: ['themeDefaultProps'})), all the attributes will be added to the API page instead of just the theme dfault props one.

THe reason is that the script filter the skipped test but do not take into consideration the only:

https://github.com/mui/material-ui/blob/master/packages/api-docs-builder/utils/parseTest.ts/#L164-L185

Solution can either be to remove only from describe conformance, or take only into consideration in the parsing

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