Add Product Guiding Principles to Direction

Why is this change being made?

Updating Direction page based on SKO deck so that the Direction page is the SSOT for Product Strategy.

To make this easier to merge, reduced scope of this MR to just these changes:

• Adding Guiding Principles based on SKO deck
• Condense ML/AI at GitLab into GitLab for Data Science FY investment theme

Created these other MRs for other changes

• Add detail and links to FY Investment Themes section based on SKO deck !121955 (merged)
• Move DevSecOps Stages and Personas sections down + condense Contributions into sub-section of DevSecOps Stages !121958 (diffs)
• Remove Mobile Strategy and SEG sections !121959 (merged)

Issue with all MRs

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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