Make terminal auto approve more aware of paths

[Copilot]

When configuring terminal auto approval, users expect path variations to work intuitively. Previously, if you approved bin/foo, it would only match that exact path separator style, requiring separate entries for Windows and Unix variants.

This change makes the auto approval system path-aware by detecting strings that contain path separators (/ or \) and creating flexible regex patterns that handle common path variations:

Before:

{
  "terminal.integrated.autoApprove": {
    "bin/foo": true,
    "bin\\foo": true,     // Required separate entry
    "./bin/foo": true,    // Required separate entry  
    ".\\bin\\foo": true   // Required separate entry
  }
}

After:

{
  "terminal.integrated.autoApprove": {
    "bin/foo": true  // Now matches all variations automatically
  }
}

With this change, approving bin/foo automatically allows:

• bin/foo (exact match)
• bin\foo (Windows backslashes)
• ./bin/foo (current directory with forward slash)
• .\bin\foo (current directory with backslash)
• Mixed separator combinations

The implementation:

1. Detects path-like strings by checking for / or \ separators
2. Creates flexible regex patterns using character classes [/\\] for separators
3. Adds optional prefix matching for ./ and .\ patterns
4. Preserves existing behavior for non-path commands (like echo, ls)
5. Properly escapes regex special characters in path names

This makes the terminal auto approval feature more intuitive for cross-platform development workflows where the same logical path might be referenced with different separator styles.

Fixes #259672.

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