test(cli/install): Refactor tests to use default install commands

[ksubrmnn]

Description:
This PR uses the default install command and the default values map for all tests. This cuts down on the number of lines of code considerably, making this file easier to read and edit.

Additionally, new tests were being added by copying old tests. This resulted in each test configuring certain settings in different ways across the tests even though no meaningful difference was made by these changed settings. For example, a test for checking the namespace could include settings that were used in a test for cert-manager.

This made the tests more difficult to interpret as it was not possible to tell exactly which fields were necessary for the testing scenario. However this new format makes it easy to see which settings differ from the default.

Affected area:

• New Functionality [ ]
• Documentation [ ]
• Install [ ]
• Control Plane [ ]
• CLI Tool [ ]
• Certificate Management [ ]
• Networking [ ]
• Metrics [ ]
• SMI Policy [ ]
• Security [ ]
• Tests [X]
• CI System [ ]
• Performance [ ]
• Other [ ]

Please answer the following questions with yes/no.

• Does this change contain code from or inspired by another project? If so, did you notify the maintainers and provide attribution?
  No