Do not try to generate test command for temporary files

[vinistock]

Motivation

For unsaved files, the URI has no path and therefore there's no way to run tests defined in them. Currently, we're breaking when generating the test command.

Implementation

We need to check if there's a path before trying to generate test commands or code lens.

Automated Tests

Added an example that reproduces the problem.

[github-actions]

Benchmark results in seconds (slowest at top)

          textDocument/completion average: 0.206018 std_dev: 0.003755
          textDocument/diagnostic average: 0.043393 std_dev: 0.009991
          textDocument/definition average: 0.004942 std_dev: 0.002871
      textDocument/selectionRange average: 0.004248 std_dev: 0.00062
   textDocument/documentHighlight average: 0.002652 std_dev: 0.000266
        textDocument/documentLink average: 0.002561 std_dev: 0.000297
 textDocument/semanticTokens/full average: 0.002528 std_dev: 0.000343
            textDocument/codeLens average: 0.002523 std_dev: 0.000251
      textDocument/documentSymbol average: 0.00252 std_dev: 0.00017
        textDocument/foldingRange average: 0.002476 std_dev: 0.000145
textDocument/semanticTokens/range average: 0.001645 std_dev: 9.9e-05
               codeAction/resolve average: 0.00148 std_dev: 0.000129
               textDocument/hover average: 0.001422 std_dev: 0.000135
           textDocument/inlayHint average: 0.001418 std_dev: 0.000152
    textDocument/onTypeFormatting average: 0.000854 std_dev: 0.000101
          textDocument/formatting average: 0.000837 std_dev: 0.000291
          textDocument/codeAction average: 0.000825 std_dev: 8.8e-05


================================================================================
Comparison with main branch:

 textDocument/semanticTokens/full unchanged
textDocument/semanticTokens/range unchanged
      textDocument/documentSymbol unchanged
        textDocument/foldingRange unchanged
          textDocument/formatting unchanged
          textDocument/diagnostic unchanged
        textDocument/documentLink unchanged
           textDocument/inlayHint unchanged
      textDocument/selectionRange unchanged
   textDocument/documentHighlight unchanged
               textDocument/hover unchanged
          textDocument/codeAction unchanged
    textDocument/onTypeFormatting unchanged
               codeAction/resolve unchanged
          textDocument/completion unchanged
            textDocument/codeLens unchanged
          textDocument/definition unchanged


================================================================================
Missing benchmarks:

RubyLsp::Requests::ShowSyntaxTree

[andyw8]

(nit) could this be be part of the return unless... guard above?