fix(js_formatter): don't hug blocks in case clauses with multiple statements

[faultyserver]

Summary

I noticed this while checking diagnostics from trying to migrate our monorepo. Switch case clauses with a block body let the opening brace of the clause hug the same line as the case itself, like:

switch(true) {
  case true: {
    const a = 1;
  }
}

But when the same case clause contains additional statements after the block, Prettier doesn't allow them to hug:

switch(true) {
  case true: {
    const a = 1;
  }
  break;
}

// Prettier
switch (true) {
  case true:
    {
      const a = 1;
    }
    break;
}


// Biome 
switch (true) {
  case true: {
    const a = 1;
  }
  break;
}

This PR makes Biome match Prettier's behavior here: if there's more than a single non-empty block statement in the case clause, the braces won't be allowed to hug.

I think this is actually good behavior, even if it's somewhat ugly, because it shows more clearly that statements after the block (i.e., the break; above), are still part of the case clause, even though the braces might suggest the clause has ended.

I also noticed that trailing comments weren't staying on the same line, so I fixed that as part of this as well.

Test Plan

Added a new test case to cover this.

[netlify]

✅ Deploy Preview for rad-torte-839a59 canceled.

Name	Link
🔨 Latest commit	33a8d84
🔍 Latest deploy log	https://app.netlify.com/sites/rad-torte-839a59/deploys/656d6f8501fd4a00082c8b2d