Adding Skip attribute or adjusting skip condition for flaky tests

[dmitrii-drobotov]

Related issues:

• List of tests to add a [Skip] attribute to #6713
• ToolStrip tests is flaky in arm64 and x86 CI build #6610
• Re-enable skipped test: Button_AchorNone_NoResizeOnWindowSizeTallerAsync #6714
• Flaky test DataGridView_RowHeadersWidth_SetWithHandle_GetReturnsExpected #6739
• Flaky test DataGridView_OnColumnHeadersHeightChanged_InvokeWithHandle_CallsColumnHeadersHeightChanged #6926

Proposed changes

• Skip tests that sometimes fail in CI and block deployment.
• Some tests were already skipped for certain architecture but turned out to be flaky for other architectures as well (ToolStrip tests is flaky in arm64 and x86 CI build #6610, Flaky test DataGridView_OnColumnHeadersHeightChanged_InvokeWithHandle_CallsColumnHeadersHeightChanged #6926, Flaky test DataGridView_RowHeadersWidth_SetWithHandle_GetReturnsExpected #6739). This PR removes skip condition for such tests so that they are skipped for all architectures.
• Another test (Re-enable skipped test: Button_AchorNone_NoResizeOnWindowSizeTallerAsync #6714) was reported to be flaky but not skipped yet.

Customer Impact

• No

Regression?

• No

Risk

• Minimal

Test methodology

• CI build

Microsoft Reviewers: Open in CodeFlow

[dnfadmin]

All CLA requirements met.