🎨 Remove Superfluous Rule from helm-dashboard ClusterRole

[toddtee]

A superfluous rule is added to the ClusterRole upon creation, when the dashboard.allowWriteActions value is set to true. This commit will ensure that only a single rule is created within the ClusterRole, regardless of whether the dashboard.allowWriteActions value is enabled or not.
The verbs within this rule will update accordingly.

Fixes Issue

Closes #186.

Changes proposed

• Creates a single rule withing the ClusterRole, rather than two.
• Verb list for proposed single rule will be updated, according to value of dashboard.allowWriteActions
• When dashboard.allowWriteActions is true, write-oriented verbs will be include
• When dashboard.allowWriteActions is false, write-oriented verbs will be excluded

Check List (Check all the applicable boxes)

• My code follows the code style of this project.
• My change requires changes to the documentation.
• I have updated the documentation accordingly.
• All new and existing tests passed.
• The title of my pull request is a short description of the requested changes.

Note to reviewers

I have tested this locally and confirmed the ClusterRole updates accordingly.

[toddtee]

This PR will address Issue #186.

[undera]

Welcome to contributors!