Fix copy and colors for open source filter

[gaspergrom]

Changes proposed ✍️

• fix copy on member table for oss filter
• fix color on caret

What

🤖 Generated by Copilot at 0709014

This pull request updates the frontend to improve the presentation and explanation of the open source contributions attribute for members. It changes the labels, tooltips, and styles of the table column and the panel title in the member list and member view pages.
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🤖 Generated by Copilot at 0709014

We're sorting out the tables, me hearties, yo ho ho
We're making them more visible with !important so
We're adding tooltips to the titles, me hearties, yo ho ho
We're using open source instead of OSS, you know

Why

How

🤖 Generated by Copilot at 0709014

• Add and update tooltips and labels for the open source contributions attribute in the member list and view pages (link, link, link)
• Ensure the ascending sort caret has a dark border in the member-list-table.vue component by adding the !important flag to the border-b-gray-900 utility class in table.scss (link)

Checklist ✅

• Label appropriately with Feature, Improvement, or Bug.
• Add screehshots to the PR description for relevant FE changes
• New backend functionality has been unit-tested.
• API documentation has been updated (if necessary) (see docs on API documentation).
• Quality standards are met.