Remove orphaned keys from package.nls.json (#22478)

[Shriraj Jadhav (Shriraj1901)]

Description

Removes 8 unused localization keys from package.nls.json that no longer have any corresponding reference in package.json or anywhere in the extension source code (src/).

The orphaned keys break down into two groups:

• TensorBoard-related (6 keys): TensorBoard support was moved to a separate extension (per the existing deprecation message in the file itself), but these command titles, experiment description, and log directory strings were never cleaned up.
• Walkthrough (2 keys): The old "Select a Python Interpreter" walkthrough step's title/altText, which was merged into the newer "Select or create a Python environment" step.

How this was verified

Ran a script comparing every %key% reference across package.json against package.nls.json, and separately searched the entire src/**/*.ts for any remaining usage of each orphaned key. All 8 came back with zero references anywhere in the codebase.

Fixes #22478

[Bill Schnurr (bschnurr)]

🔒 Automated review in progress — Bill Schnurr (@bschnurr) is auto-reviewing this PR.

[Bill Schnurr (bschnurr)]

Result: 🔴 could-not-verify

Verification details

Verification: The relevant tests could not be fully run in the isolated environment; this review is not fully verified.

Summary: The verification sandbox failed during staging, before the discovery command or tests could execute. Read-only inspection found no dedicated test covering removal of orphaned `package.nls.json` keys, and the PR adds no tests. Therefore, runtime verification could not be completed.

Test runs: 1 not run

• ⚠️ Not run | Dependency and test discovery preflight | printf 'sandbox_profile=%s\n' "${AUTOMATION_SANDBOX_PROFILE:-}"; printf '%s\n' '--- changed files ---'; base=$(git merge-base HEAD origin/main 2>/dev/null || git merge-base HEAD upstream/main 2>/dev/null); printf 'base=%s\n' "$base"; git diff --name-status "$base"..HEAD; printf '%s\n' '--- dependency/tool availability ---'; if [ -d node_modules ]; then echo 'node_modules=present'; else echo 'node_modules=missing'; fi; node --version; if [ -x node_modules/.bin/mocha ]; then node_modules/.bin/mocha --version; else echo 'mocha=missing'; fi; printf '%s\n' '--- relevant scripts/config ---'; node -e "const p=require('./package.json'); for (const [k,v] of Object.entries(p.scripts||{})) if (/test:functional|compile/.test(k)) console.log(k+'='+v)"; sed -n '1,120p' build/.mocha.functional.json

⚠️ Dependency and test discovery preflight diagnostic output

PermissionError: [WinError 32] The process cannot access the file because it is being used by another process: 'C:\\Users\\bschnurr\\AppData\\Local\\Temp\\automation-job-ready-4gxayiva'

[Bill Schnurr (bschnurr)]

Approved via Review Center.

[Shriraj Jadhav (Shriraj1901)]

@microsoft-github-policy-service agree

[Bill Schnurr (bschnurr)]

Approved via Review Center.

[Heejae Chang (heejaechang)]

Approved via Review Center.