feat: common CLI dir checks in connectivity checker [IDE-1557]

[rrama]

We have a customer who was having issue with the CLI download directories, this should help diagnose the problem. We can't have these directories be checked by just the LS (like I will do with delta scans having them be passed in the config to check), as it would be a chicken and egg problem. Although, giving it more thought while typing this, we could instruct customers to use a CLI binary in a temporary location for testing and then load the dirs from the IDE...

Additionally:

• Output the env vars: NODE_EXTRA_CA_CERTS, KRB5_CONFIG, and KRB5CCNAME.
• NODE_EXTRA_CA_CERTS is not mentioned in the docs, but is supported and even recommended by this tool itself.
• Kerberos ones are mentioned in the docs here.
• Fixed a bug where a failure to retrieve the orgs would be considered a formatter error, preventing output.
• Output the current user's username.

This is heavily vibe coded, so do fully scrutinise it.
The AI told me about the directory I labeled "Runtime Cache for Temporary Files", I haven't fully confirmed its actual use, but does indeed seem to be the cache dir for GAF.
If you would prefer this to be its own workflow and/or with a generic diagnostics workflow, then I can do that. I just didn't want to invest too much time into this before getting people's thoughts on it.

New output on MacOS

Current User Information

Username: ben

Potential Snyk Used Configuration and CLI Download Directories

Directory: /Users/ben/Library/Application Support/snyk/vscode-cli (Purpose: Default CLI Download Location for VS Code Extension)
✓ Exists
✓ Writable (permissions: 0755)
Found 1 potential Snyk CLI binary/binaries:
• snyk-macos-arm64 (permissions: 0744)

Directory: /Users/ben/.local/share/snyk/vscode-cli (Purpose: Alternative CLI Download Location for VS Code Extension)
⚠ Does not exist
Nearest existing parent: /Users/ben/.local/share
✓ Writable (permissions: 0755)

Directory: /Users/ben/.snyk (Purpose: Default CLI Download Location for Eclipse Plugin)
✓ Exists
✓ Writable (permissions: 0755)
Found 1 potential Snyk CLI binary/binaries:
• snyk-macos-arm64 (permissions: 0744)

Directory: /Users/ben/.local/share/snyk-ls (Purpose: Default CLI Download Location for Language Server)
⚠ Does not exist
Nearest existing parent: /Users/ben/.local/share
✓ Writable (permissions: 0755)

Directory: /Users/ben/Library/Application Support/snyk (Purpose: Language Server Config Storage)
✓ Exists
✓ Writable (permissions: 0755)

Directory: /Users/ben/Library/Caches/snyk/snyk-cli (Purpose: Runtime Cache for Temporary Files)
✓ Exists
✓ Writable (permissions: 0755)

New output on Windows

Current User Information

Username: BENDURRANS6F87\ben

Potential Snyk Used Configuration and CLI Download Directories

Directory: C:\Users\ben\AppData\Local\snyk\vscode-cli (Purpose: Default CLI Download Location for VS Code Extension)
✓ Exists
✓ Writable (permissions: 0777)
Found 1 potential Snyk CLI binary/binaries:
• snyk-win.exe (permissions: 0666)

Directory: C:\Users\ben\AppData\Local\Snyk (Purpose: Default CLI Download Location for Eclipse Plugin and Visual Studio Plugin)
✓ Exists
✓ Writable (permissions: 0777)
No Snyk CLI binaries found

Directory: C:\Users\ben\AppData\Local\snyk (Purpose: Language Server Config Storage)
✓ Exists
✓ Writable (permissions: 0777)

Directory: C:\Users\ben\AppData\Local\snyk\snyk-cli (Purpose: Runtime Cache for Temporary Files)
✓ Exists
✓ Writable (permissions: 0777)

[snyk-io]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scanner	Critical	High	Medium	Low	Total (0)
✅	Open Source Security	0	0	0	0	0 issues
✅	Licenses	0	0	0	0	0 issues
✅	Code Security	0	0	0	0	0 issues

💻 Catch issues earlier using the plugins for VS Code, JetBrains IDEs, Visual Studio, and Eclipse.

[snyk-io]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scanner	Critical	High	Medium	Low	Total (0)
✅	Open Source Security	0	0	0	0	0 issues
✅	Licenses	0	0	0	0	0 issues
✅	Code Security	0	0	0	0	0 issues

💻 Catch issues earlier using the plugins for VS Code, JetBrains IDEs, Visual Studio, and Eclipse.