Improve type ordering

[ahejlsberg]

Implements what I discuss here.

Fixes #1278.

[Copilot]

Pull Request Overview

Updates the internal type flag ordering for complexity and adjusts compiler error baselines to match the new union type representation.

• Reorders TypeFlags bit positions so that more complex types (indexed access, conditional) sort later
• Updates compiler error baselines in testdata to reflect the new string representation order
• Adds a descriptive comment explaining the importance of numeric ordering in CompareTypes

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
testdata/baselines/reference/submodule/compiler/awaitedTypeNoLib.errors.txt.diff	Adjusted expected error output to swap the order of the union type representation
testdata/baselines/reference/submodule/compiler/awaitedTypeNoLib.errors.txt	Synchronized the baseline error file with updated union ordering
internal/checker/types.go	Moved IndexedAccess and Conditional flags to higher bits, added comment explaining type ordering

Comments suppressed due to low confidence (1)

internal/checker/types.go:411

• Consider adding unit tests for CompareTypes to verify that TypeFlags ordering (TemplateLiteral, StringMapping, IndexedAccess, Conditional) correctly influences type sorting, preventing regressions in type complexity ordering.

// Note that for types of different kinds, the numeric values of TypeFlags determine the order