[Repo Assist] test: add regression tests for false positive code fix scenarios (issues #1259, #1362)

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Summary

Adds two regression test cases as requested by the maintainer in issues #1259 and #1362, to verify these false positive code fix scenarios are no longer present.

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Test 1: RemoveRedundantQualifier false positive when variable shadows property (issue #1259)

Scenario: When a local variable user shadows the Envelop.user property, FSAC was incorrectly offering the "Remove redundant qualifier" fix on envelop.user.Name.

Test: checkNotApplicable — verifies the fix is not offered for:

type User(name: string) =
  member val Name = name with get

type Envelop() =
  member val user = User("toto") with get

let test () =
  let user = User("user")
  let envelop = Envelop()
  if envelop.user.Name = "maxime" then
    printfn "It works"
  else
    printfn "It doesn't work"

If this test fails, the false positive is still present (the fix is still being offered when it shouldn't be). If it passes, the upstream FCS diagnostic is no longer incorrectly emitted for this scenario.

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Test 2: RemoveUnnecessaryParentheses false positive in fluent method chain with decimal literal (issue #1362)

Scenario: bg.lighten(0.2).hexa () — FSAC was incorrectly offering to remove the parens around 0.2, which would produce invalid code bg.lighten 0.2.hexa ().

Test: checkNotApplicable — verifies the fix is not offered for bg.lighten((0.2)).hexa ().

The upstream fix landed in FCS 43.10.101 via dotnet/fsharp#18350. This test confirms the fix is in effect.

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Test Status

• ✅ Build: dotnet build test/FsAutoComplete.Tests.Lsp -f net8.0 — 0 errors
• ✅ Format: dotnet fantomas --check — passes

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