fix: show MCP config file paths correctly in error messages

[laileni-aws]

Problem

When MCP config loading fails, the error is shown to the user (in the MCP servers view / status), and the message embeds the config file path. That message is rendered as markdown, so a Windows path segment such as \.aws has its backslash stripped (\. is a markdown escape). The path is therefore displayed incorrectly — e.g. C:\Users\me\.aws\amazonq\mcp.json shows as C:\Users\me.aws\amazonq\mcp.json.

This misleads users into thinking Amazon Q is looking at the wrong path (a reported case: a user concluded "it's a path issue, the file doesn't exist" when the path was actually correct and their mcp.json was simply empty — "Unexpected end of JSON input").

Fix

Wrap the file path in a markdown code span (backticks) so it renders verbatim, including backslashes:

• server/aws-lsp-codewhisperer/src/language-server/agenticChat/tools/mcp/mcpUtils.ts: the "Failed to read", "Invalid JSON", and "missing/invalid mcpServers" messages now wrap the path as `<path>`.
• mcpManager.ts (getConfigLoadErrors): the File: <path> prefix now wraps the path/server key as File: `<path>`.

Testing

• Updated mcpManager.test.ts assertions for the new File: `…``` format.
• Added a test asserting a Windows path containing a \.aws segment is wrapped in a code span (so its backslash survives markdown rendering).
• Ran the MCP unit tests (mcpManager.test.ts + mcpUtils.test.ts): 112 passing.
• prettier --check passes; eslint reports no new issues (only pre-existing warnings unrelated to this change).

Notes

• This corrects the misleading path display; the underlying config errors (e.g. empty/invalid mcp.json) are unchanged and still reported.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 60.16%. Comparing base (abb1096) to head (0e08f9e).

Files with missing lines	Patch %	Lines
.../language-server/agenticChat/tools/mcp/mcpUtils.ts	66.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2785      +/-   ##
==========================================
- Coverage   60.20%   60.16%   -0.05%     
==========================================
  Files         281      281              
  Lines       71191    71194       +3     
  Branches     4575     4560      -15     
==========================================
- Hits        42861    42832      -29     
- Misses      28241    28274      +33     
+ Partials       89       88       -1     

Flag	Coverage Δ
unittests	60.16% <85.71%> (-0.05%)	⬇️

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