Adds Int Support competencies

Why is this change being made?

Support needs to add competencies to the new career matrices for Engineering. This MR adds the intermediate level ones.

Closes gitlab-com/support/support-team-meta#2423 (closed)

Author Checklist

• Provided a concise title for the MR
• Added a description to this MR explaining the reasons for the proposed change, per say-why-not-just-what
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mentioned in issue gitlab-com/support/support-team-meta#2423 (closed)

added 1 commit

• e343ddc1 - Adds competency of following and improving processes

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added 1 commit

• 19bdcaf2 - Adjusts some language and adds comms competency

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added 1 commit

• 4c99704b - Improves wording on third competency

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added handbook label

unmarked as a Work In Progress

added this merge request to the merge train at position 2

mentioned in commit ed07da6e

merged