♻️ [Database] Deprecate `db.pool.size.*` settings

[Coduz]

This PR deprecates commons.db.pool.size.min and commons.db.pool.size.max settings since they have changed their meaning/usage after #4067

Related Issue This PR improves changes made in #4067

Description of the solution adopted Deprecated usage of:

• commons.db.pool.size.min - not used since $4067
• commons.db.pool.size.max - replaced by commons.db.pool.size due to #4067
• commons.db.pool.idle.timeout - not used since $4067

Removed:

• commons.db.pool.size.initial - not used nor referenced
• commons.db.pool.borrow.timeout - not used nor referenced

which were no longer used.

Introduced a new commons.db.pool.size setting to manage the fixed pool size.

Screenshots None

Any side note on the changes made Introduced UPGRADE_NOTES.md file to start maintaining a verbose upgrade notes log for notable changes in version