Error slurp backward commented expresssions

[jramosg]

What has changed?

When attempting to perform a "slurp backward" operation with a previous ignored/commented expression (using #_ ), the operation would produce incorrect results and throw and error.

• The forwardSexp method in toker-cursor was treating #_ as a single token instead of treating #_(form) as a unified s-expression.
  Now forwardSexp always moves past the complete ignored form #_(form) as a single unit:

case 'ignore':
  // Always include the ignored form as part of this sexp
  this.next();                                              // Move past #_
  this.forwardSexp(skipComments, skipMetadata, skipIgnoredForms);  // Move past (form)
  if (skipIgnoredForms) {
    // When skipping, continue to the next non-ignored sexp
    break;
  }
  // When not skipping, stop here: the ignored form is the sexp we found
  if (stack.length <= 0) {
    return true;
  }
  break;

• backwardSexp would position the cursor at the form being ignored rather than at the #_ marker itself when slurping.
• After calling backwardSexp to find the previous form, we now check if it's preceded by an #_ ignore marker

Fixes #3025

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[PEZ]

Thanks!