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test: add coverage for ECHAR error branches in SPARQL 1.2 string rule

Add two negative test cases that exercise the error paths introduced by
the two-pass UCHAR+ECHAR string decode in the SPARQL 1.2 grammar:

- codepoint-esc-05-bad: \u005C decodes to \ (backslash), leaving a
  trailing unpaired \ at the end of the string literal → error
- codepoint-esc-06-bad: \u005Cx decodes to \x, where x is not a
  valid ECHAR character → error

Both paths were previously uncovered; coverage is back to 100%.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

740 of 740 branches covered (100.0%)

Branch coverage included in aggregate %.

5407 of 5407 relevant lines covered (100.0%)

284868.39 hits per line