feat(files) Add combined commits together for file upload/download

[chriscollins3456]

This PR brings some commits to OSS that are needed for polish around the file upload/download experience:

• fix(s3) Cache S3Presigner to prevent connection pool shutdown errors
• fix(ui) Fix uploading images with spaces in them
• feat(ui) Improve docs image upload experience with new file upload flow
• fix(files) Properly separate user uploaded file names from GUID
• feat(files) Extend supported file types after consulting with Claude

It also sneaks one other commit that needs to be brought to OSS since i'm doing a roundup PR anyways:

• fix(ui) Fix viewing domain hierarchy view with view auth

[alwaysmeticulous]

✅ Meticulous spotted 0 visual differences across 1016 screens tested: view results.

Meticulous evaluated ~8 hours of user flows against your PR.

_{Expected differences? Click here. Last updated for commit cb37bb8. This comment will update as new commits are pushed.}

[codecov]

Bundle Report

Changes will increase total bundle size by 2.63kB (0.01%) ⬆️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
datahub-react-web-esm	28.58MB	2.63kB (0.01%) ⬆️

Affected Assets, Files, and Routes:

view changes for bundle: datahub-react-web-esm

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
assets/index-*.js	2.63kB	18.96MB	0.01%

Files in assets/index-*.js:

• ./src/alchemy-components/components/Editor/toolbar/AddImageButtonV2.tsx → Total Size: 2.71kB

• ./src/alchemy-components/components/Editor/extensions/fileDragDrop/fileUtils.ts → Total Size: 4.96kB

• ./src/alchemy-components/components/Editor/toolbar/FileUploadButton.tsx → Total Size: 1.19kB

• ./src/alchemy-components/components/Editor/toolbar/Toolbar.tsx → Total Size: 4.29kB

• ./src/app/shared/hooks/useFileUpload.ts → Total Size: 1.45kB

• ./src/alchemy-components/components/Editor/extensions/htmlToMarkdown.tsx → Total Size: 4.78kB

• ./src/app/homeV3/modules/hierarchyViewModule/components/domains/hooks/useDomainsByUrns.ts → Total Size: 850 bytes

• ./src/alchemy-components/components/Editor/toolbar/FileUploadContent.tsx → Total Size: 3.34kB

[codecov]

Codecov Report

❌ Patch coverage is 78.87324% with 15 lines in your changes missing coverage. Please review.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
...n/java/com/linkedin/metadata/utils/aws/S3Util.java	65.38%	8 Missing and 1 partial ⚠️
...odule/components/domains/hooks/useDomainsByUrns.ts	14.28%	6 Missing ⚠️

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