Don't include talent assessment ratings in promo docs

Why is this change being made?

Based on some feedback from my own promo doc, we should not be referencing team member's performance ratings:

We should not be sharing the performance and growth ratings for any team member outside of their reporting structure. It needs to be removed from this doc since it will be shared with all GitLab team members. These ratings are taken into consideration during promotion calibrations and documented elsewhere in the process.

Author Checklist

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