Draft: Move Staff TAM (Product) to Staff CSE

Why is this change being made?

With the implementation of Customer Success Engineer job specialty, the role of Staff TAM (Product) aligns with the responsibilities of a CSE. This moves Staff TAM (Product) job details to the role of Staff CSE.

Staff TAM (Account) transition to Staff TAM

Defined Senior CSE Requirements and Responsibilities

Author Checklist

• Provided a concise title for this Merge Request (MR)
• Added a description to this MR explaining the reasons for the proposed change, per say why, not just what
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  • If your manager does not have merge rights, please ask someone to merge it AFTER it has been approved by your manager in #mr-buddies
• If the changes affect team members, or warrant an announcement in another way, please consider posting an update in #whats-happening-at-gitlab linking to this MR
  • If this is a change that directly impacts the majority of global team members, it should be a candidate for #company-fyi. Please work with internal communications and check the handbook for examples.

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