ATLAS-5349: Ability to Export Apache Atlas Business Glossary to Excel/CSV from UI

[pawarprasad123]

What changes were proposed in this pull request?

This PR adds Glossary Terms & Categories list export (CSV/XLSX) on React (v3) and Classic (v2), integrates async exports into the header download panel, and fixes several glossary navigation and download UX issues on both UIs.

Automated tests: 399/399 pass

Glossary terms list & export

New Glossary Terms & Categories page on React (GlossaryTermsListPage) and Classic (GlossaryTermsListLayoutView)
Download dropdown (CSV / XLSX) enqueues async export via POST /v2/glossary/create_file
Export uses the same filter body as the table search
Status column with GlossaryStatusBadge (Active / Draft / Deprecated)
Glossary export navigation moved to sidebar ⋮ menu (removed header glossary list icon)

Header download panel (React + Classic)

Merges search + glossary download records, dedupes by filename, sorts newest first
Toggle: ON (default) = all files (pending + completed); OFF = completed only
State-based tooltips for toggle
Pending rows show spinner; completed rows show download action
Removed per-file source labels (Glossary export / Search export)
Classic: panel closes on outside click (search, page content)
Classic: filename ↔ icon spacing aligned with React (gap: 16px)
Classic: renamed showCompletedDownloads → showAllDownloads (matches React semantics)
Empty state moved from inline styles to .download-list-empty SCSS class

Sidebar & import

Import Glossary Term and Download Import template always enabled (React + Classic)
React import success triggers glossary sidebar refresh via ImportDialog.onImportSuccess

Classic glossary fixes

Term name links use correct gType/gId query params (fixes category API 400 on term click)
Classifications column editable (add/remove tags)
Terms-list URL stability on refresh/tree load
Terms-list refresh + Download actions aligned horizontally

Code coverage (PR-changed React files)

• Statements - 98.61%
• Branches - 88.02%
• Functions- 92.37%
• Lines - 98.61%

Over all coverage on react ui:

• Statements - 85.75% (46,451 / 54,168)
• Branches - 82.00% (6,965 / 8,493)
• Functions- 80.02% (1,274 / 1,592)
• Lines- 85.75% (46,451 / 54,168)

Test run: 189 suites, 4,790 tests — all passed (≈175s)

How was this patch tested?

Manual on Both UI
and Automated react

cd dashboard
npm run lint          # 0 errors
npm run build         # pass
npm test -- --watchAll=false \
  --testPathPattern="GlossaryTermsListPage|downloadRecords|Header.test|ImportDialog|SideBarTree|glossaryExport|glossaryStatus|GlossaryStatusBadge|glossaryTermsListColumns|glossaryApiMethod|glossaryUrl"
# Result: 399/399 pass

Test plan

• Lint passes (0 errors)
• Build passes
• 399 automated tests pass
• Code coverage ≥ 98% statements on changed React files
• Classic manual (download panel, terms-list export, sidebar import)
• React manual (download panel, terms-list export, import refresh)

[farhank31]

LGTM 👍