refactor: Replace information_schema.tables for db size with du (backport #4031)

[mergify]

Required for frappe/agent#364

---

This is an automatic backport of pull request #4031 done by Mergify.

[codecov]

Codecov Report

❌ Patch coverage is 39.13043% with 28 lines in your changes missing coverage. Please review.
✅ Project coverage is 44.84%. Comparing base (63d81a5) to head (1657b29).

Files with missing lines	Patch %	Lines
...s/press/doctype/database_server/database_server.py	32.14%	19 Missing ⚠️
press/agent.py	54.54%	5 Missing ⚠️
press/press/doctype/server/server.py	42.85%	4 Missing ⚠️

❌ Your patch check has failed because the patch coverage (39.13%) is below the target coverage (75.00%). You can increase the patch coverage or adjust the target coverage.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4044      +/-   ##
==========================================
- Coverage   44.84%   44.84%   -0.01%     
==========================================
  Files         723      723              
  Lines       49361    49390      +29     
==========================================
+ Hits        22138    22149      +11     
- Misses      27223    27241      +18     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.