EliminateOuterJoin with Like, IsTrue, IsFalse, IsNotUnknown (#21549)

## Which issue does this PR close?
   
Related to: #13232
                                                            
  ## Rationale for this change
`EliminateOuterJoin` converts LEFT/RIGHT/FULL joins to INNER joins when
WHERE clause predicates are null-rejecting. The
`extract_non_nullable_columns` function recognizes specific expression
types but was missing several common ones: `LIKE`, `IS TRUE`, `IS
FALSE`, and `IS NOT UNKNOWN`.

  All of these are null-rejecting:
  - `NULL LIKE pattern` → NULL (filtered out)
  - `NULL IS TRUE` → false (filtered out)
  - `NULL IS FALSE` → false (filtered out)
  - `NULL IS NOT UNKNOWN` → false (filtered out)

Note: `IS NOT TRUE`, `IS NOT FALSE`, and `IS UNKNOWN` are intentionally
**not** added — they return true for NULL input, so they are not
null-rejecting.

  ## What changes are included in this PR?

  Added match arms in `extract_non_nullable_columns` for:
  - `Expr::Like`
  - `Expr::IsTrue` / `Expr::IsFalse` / `Expr::IsNotUnknown`

  ## Are these changes tested?

  Yes — 7 new unit tests:
- 5 positive cases verifying outer → inner conversion (Like, IsTrue,
IsFalse, IsNotUnknown)
- 2 negative cases verifying outer join is preserved (IsNotTrue,
IsUnknown)

  ## Are there any user-facing changes?

  No API changes.

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Co-authored-by: Subham Singhal <subhamsinghal@Subhams-MacBook-Air.local>

Author: SubhamSinghal