Fix parser recovery, name resolution, and code completion for unfinished enum patterns

[auduchinok]

Fixes various IDE features for unfinished enum patterns:

match e with
| E.{caret}

[github-actions]

❗ Release notes required

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✅ Found changes and release notes in following paths:

Change path	Release notes path	Description
src/Compiler	docs/release-notes/.FSharp.Compiler.Service/11.0.100.md

[T-Gro]

Review: Approve ✅

Three well-targeted changes to fix enum pattern completion:

1. Parser recovery (pars.fsy): New ident DOT %prec prec_atompat_pathop_error rule catches incomplete paths like E. in patterns and emits "Identifier expected" — a clear improvement over the previous generic "Incomplete structured construct" messages (visible in the 3 updated baselines for Members/Object expressions).

2. Name resolution (NameResolution.fs): Extends the ExtraDotAfterIdentifier.Yes handling to include IsEnumTycon alongside IsUnionTycon, so the enum type is properly reported to the sink for IDE tooling. Correct symmetry.

3. Completion filter (FSharpCheckerResults.fs): Item.RecdField f -> f.Tycon.IsEnumTycon — since F# represents enum members as record fields internally, this is the right predicate to surface enum cases in pattern completion while keeping regular record fields out.

Observations:

• The %prec prec_atompat_pathop_error is placed at the lowest precedence level, ensuring the parser always prefers shifting (ident DOT pathOp) before falling back to this error rule. Correct.
• pathOp is also used by hashDirectiveArgument, but DOT doesn't appear in that context normally, so no impact.
• The Range.setTestSource addition in SyntaxTreeTests.fs populates the test source dictionary so range-based operations can resolve source text from memory during syntax tree tests.
• The skipped test Enum - Type 06 (E.B where B doesn't exist) honestly documents a remaining limitation.
• 10 new syntax tree baselines, 7 recovery tests, 2 completion tests — thorough coverage.

Clean, well-scoped fix.