[Repo Assist] test: add SideEffects module to TaskSeq.OfXXX.Tests.fs

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Summary

TaskSeq.OfXXX.Tests.fs had EmptySeq and Immutable modules but no SideEffects module, unlike most other test files in the suite.

This PR adds a SideEffects module with 3 new tests that document an important and subtle aspect of the ofXxx conversion functions: re-iteration semantics.

New tests

1. ofSeq re-evaluates the underlying source seq on each re-enumeration: Verifies that TaskSeq.ofSeq is lazy — each call to GetAsyncEnumerator creates a fresh IEnumerator from the underlying seq, so side effects in the seq body are re-triggered on every enumeration. After two enumerations of a 3-element side-effecting seq, the counter reaches 6.

2. ofTaskSeq with lazy seq of tasks re-creates tasks on each re-enumeration: Verifies the same lazy re-evaluation applies to TaskSeq.ofTaskSeq when the input is a lazy seq. On each enumeration, the seq is re-iterated and fresh Task objects are created and run — count goes from 3 to 6 across two enumerations.

3. ofTaskArray does not re-run tasks on re-enumeration; task results are cached: Provides the complementary case. When TaskSeq.ofTaskArray wraps a fixed array, the Task<'T> objects are created upfront (and run synchronously to completion at array-construction time). Re-enumerating the TaskSeq merely re-awaits the already-completed tasks — their results are cached in the Task object and no computation is re-run (count stays at 3 after both enumerations).

These three tests together serve as executable documentation for the distinction between lazy-seq and fixed-collection variants of the conversion functions.

Test growth

Before	After
21 tests	24 tests

Test Status

• Build: ✅ dotnet build src/FSharp.Control.TaskSeq.Test -c Release — succeeded (0 warnings, 0 errors)
• Tests: ✅ dotnet test --filter "FullyQualifiedName~TaskSeq.Tests.Conversion-From" -c Release — 24 passed, 0 failed
• Format: ✅ dotnet fantomas src/.../TaskSeq.OfXXX.Tests.fs --check — clean

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