Update team members page with actual team member usernames

What does this MR do?

Updates team.yml usernames where they either point to a vacant username or the username belongs to a community member (not a team member).

Why is this change being made?

We use the GitLab username as it appears in team.yml internally to determine access to certain things that non-team members don't have; therefore, it's important that we keep the team member usernames up to date and accurate.

Name	Team Member Page	Vacant Username	Actual Username
Ashley Jammers	https://about.gitlab.com/company/team/#ajammers	https://gitlab.com/ajammers	https://gitlab.com/ashjammers
Bilal Husain	https://about.gitlab.com/company/team/#bilal	https://gitlab.com/bilal	https://gitlab.com/bhusain
Craig Nielsen	https://about.gitlab.com/company/team/#cnielsen	https://gitlab.com/cnielsen	https://gitlab.com/CraigNielsen

Name	Team Page	Incorrect Username	Actual Username
Breno Gomes	https://about.gitlab.com/company/team/#bgomes	https://gitlab.com/bgomes	https://gitlab.com/bgomesgitlab
Daniel Jin	https://about.gitlab.com/company/team/#djin	https://gitlab.com/Djin	https://gitlab.com/djin3
Fratri Edson Silva	https://about.gitlab.com/company/team/#fsilva	https://gitlab.com/fsilva	https://gitlab.com/fratrisilva

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
  • Copy/paste the Slack conversation to document it for later, or upload screenshots. Verify that no confidential data is added, and the content is SAFE
• Assign reviewers for this MR to the correct Directly Responsible Individual/s (DRI)
  • If the DRI for the page/s being updated isn’t immediately clear, then assign it to one of the people listed in the Maintained by section on the page being edited
  • 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
  • The when to get approval handbook section explains the workflow in more detail
• 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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