[*] Chore: Mark additional tests as flaky from #6535 test runs

[etrepum]

Description

We still have a lot of tests that are flaky, which is a considerable burden on contributions and reviewing them. This is just the ones that flaked in #6535 on this particular run https://github.com/facebook/lexical/actions/runs/10481362302/job/29033662935

Test plan

Before

 9 flaky
    [chromium] › packages/lexical-playground/__tests__/e2e/CopyAndPaste/lexical/ListsCopyAndPaste.spec.mjs:111:3 › Lists CopyAndPaste › Copy and paste of partial list items into the list 
    [chromium] › packages/lexical-playground/__tests__/e2e/HorizontalRule.spec.mjs:30:3 › HorizontalRule › Can create a horizontal rule and move selection around it 
    [chromium] › packages/lexical-playground/__tests__/e2e/Links.spec.mjs:1926:3 › Links › Can handle pressing Enter inside a Link 
    [chromium] › packages/lexical-playground/__tests__/e2e/Links.spec.mjs:1960:3 › Links › Can handle pressing Enter inside a Link containing multiple TextNodes 
    [chromium] › packages/lexical-playground/__tests__/e2e/Selection.spec.mjs:877:3 › Selection › shift+arrowdown into a table, when the table is the last node, selects the whole table 
    [chromium] › packages/lexical-playground/__tests__/e2e/Selection.spec.mjs:927:3 › Selection › shift+arrowdown into a table, when the table is the only node, selects the whole table 
    [chromium] › packages/lexical-playground/__tests__/e2e/Tab.spec.mjs:20:3 › Tab › can tab + IME ─
    [chromium] › packages/lexical-playground/__tests__/e2e/TextFormatting.spec.mjs:1114:3 › TextFormatting › Regression #2523: can toggle format when selecting a TextNode edge followed by a non TextNode;  
    [chromium] › packages/lexical-playground/__tests__/regression/429-swapping-emoji.spec.mjs:21:3 › Regression test #429 › Can add new lines before the line with emoji 

After

These 9 tests are tagged @flaky

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
lexical	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 21, 2024 1:45pm
lexical-playground	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 21, 2024 1:45pm

[github-actions]

size-limit report 📦

Path	Size
lexical - cjs	29.38 KB (0%)
lexical - esm	29.24 KB (0%)
@lexical/rich-text - cjs	37.74 KB (0%)
@lexical/rich-text - esm	31.05 KB (0%)
@lexical/plain-text - cjs	36.41 KB (0%)
@lexical/plain-text - esm	28.42 KB (0%)
@lexical/react - cjs	39.64 KB (0%)
@lexical/react - esm	32.51 KB (0%)

[etrepum]

The plain text tests are expected to fail until #6535 is merged and this is updated

[potatowagon]

the criteria to mark flaky (decided with @Sahejkm ) was if a test failed on a PR due to flakiness. however also ok to adjust the criteria to occasionally include non failing tests with flaky runs, since it was a bother

[etrepum]

Every test that has a flaky run has a chance of failing, it's just probability. The more we have the more often it's going to be a problem.