Use correlated subqueries on user_statistics table in the account_view for network stats

[sureshanaparti]

Description

This PR uses scalar correlated subqueries on user_statistics table in account_view for network stats (instead of lateral join, as in #12631 - this which was reverted here: #12965, due to incompatibility with MariaDB).
This works on both MySQL and MariaDB.

Types of changes

• Breaking change (fix or feature that would cause existing functionality to change)
• New feature (non-breaking change which adds functionality)
• Bug fix (non-breaking change which fixes an issue)
• Enhancement (improves an existing feature and functionality)
• Cleanup (Code refactoring and cleanup, that may add test cases)
• Build/CI
• Test (unit or integration test code)

Feature/Enhancement Scale or Bug Severity

Feature/Enhancement Scale

• Major
• Minor

Bug Severity

• BLOCKER
• Critical
• Major
• Minor
• Trivial

Screenshots (if appropriate):

How Has This Been Tested?

• account_view updated with correlated subqueries.

SHOW CREATE VIEW account_view;

• account_netstats_view shouldn't exist, this should fail.

SHOW CREATE VIEW account_netstats_view;

• account_view queries execute in less time than before (query performance improved).

SELECT * FROM account_view WHERE id = 3;

• EXPLAIN shows ref access on user_statistics (not index scan)

EXPLAIN ANALYZE SELECT * FROM account_view WHERE id = 3 \G

How did you try to break this feature and the system with this change?

[codecov]

Codecov Report

❌ Patch coverage is 62.50000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 17.71%. Comparing base (5dcb8ab) to head (1ad95b3).

Files with missing lines	Patch %	Lines
...ava/com/cloud/upgrade/dao/Upgrade42210to42220.java	57.14%	3 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff            @@
##               4.22   #13899   +/-   ##
=========================================
  Coverage     17.71%   17.71%           
- Complexity    15858    15860    +2     
=========================================
  Files          5926     5927    +1     
  Lines        533613   533621    +8     
  Branches      65285    65285           
=========================================
+ Hits          94517    94525    +8     
  Misses       428415   428415           
  Partials      10681    10681           

Flag	Coverage Δ
uitests	3.69% <ø> (ø)
unittests	18.79% <62.50%> (+<0.01%)	⬆️

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[sureshanaparti]

@blueorangutan package