[patch] Enable Db2uInstance type rotation in build-system

[jainyjoseph]

Description

This PR adds support for rotating between Db2uCluster and Db2uInstance deployment types based on the day of the week, enabling automated testing of both deployment methods.

Changes

• app.py: Added catalogDb2uKind attribute to read db2u_kind_default from catalog metadata
• db2Settings.py: Added setDB2uKindDefault() method to handle catalog defaults with dev mode override logic
• argParser.py: Added "rotate" as a valid choice for --db2u-kind argument
• summarizer.py: Added display of db2u_kind parameter in installation summary

Behavior

Non-Dev Mode:

• Always uses catalog default (e.g., "db2ucluster")
• CLI argument --db2u-kind is ignored
• Ensures production consistency

Dev Mode:

• Allows CLI override via --db2u-kind argument
• Supports values: db2ucluster, db2uinstance, rotate
• Falls back to catalog default if not specified

Rotate Option:

• Passes "rotate" value to Ansible for weekday-based resolution
• Enables automated testing of both deployment types

Testing

Test results can be reffered in Jira Story MASCORE-15176

NB: Related PR's:
ibm-mas/ansible-devops#2358
ibm-mas/python-devops#421
https://github.ibm.com/maximoappsuite/build-system/pull/1071