feat: add lock icon for private agents and devices (fixes #345)

[Nagachandan P (NagachandanP)]

fixes #345

Add lock icon for private agents and devices (fixes #345)

Description

Adds a yellow lock icon and explanatory tooltip for private agents and private devices on the Connected Devices page.

• Private agent: indicated when an agent.teamId exists (shows lock + tooltip Private — Team: <teamName>).
• Private device: indicated when item.isPrivate is true (shows lock + tooltip Private device).

Linked GitHub issue ID: #345

Pull Request Checklist

• Tests for the changes have been added (for bug fixes / features)
• Code compiles correctly with all tests passed (manual smoke; unit tests not included in this PR)
• I've read the contributing guide and followed recommended practices for UI changes
• Wikis / README updated if needed

Does this introduce a breaking change?

• Yes
• No

How you tested it

• Manual visual verification: dev server (webpack) — lock appears next to private items and tooltip shows expected text.
• A unit test was created during development to verify the device lock icon rendering, but test infra was intentionally removed from this minimal PR per contributor request. If you want tests included, I can add them in a follow-up or separate PR.
• Screenshot

Type of change: Feature

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If you need help or want tests included, open an issue: https://github.com/microsoft/HydraLab/issues/new

[jianyuyouyin]

来信已收到!

[Nagachandan P (NagachandanP)]

@microsoft-github-policy-service agree

[Nagachandan P (NagachandanP)]

Updated the commit email to match my GitHub account and signed the CLA. Could someone please approve the CI workflow run? Thanks!