fix: initialize cli colors

[arinda-arif]

Color initialization is being done in the root command's PersistentPreRun function. However, this function is not being run as it is overridden by the child's PersistentPreRun.

The color init is not necessarily placed in the root's PersistentPreRun, thus moving it to the root command's constructor.

[coveralls]

Pull Request Test Coverage Report for Build 2447308666

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 399 unchanged lines in 29 files lost coverage.
• Overall coverage increased (+2.1%) to 77.104%

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Files with Coverage Reduction	New Missed Lines	%
api/handler/v1beta1/namespace.go	1	94.44%
models/plugin.go	1	2.24%
extension/extension.go	2	60.0%
service/namespace_service.go	2	96.97%
service/project_service.go	2	93.33%
utils/file.go	2	35.0%
api/handler/v1beta1/backup.go	3	96.67%
job/deploy_manager.go	3	90.2%
api/handler/v1beta1/project.go	4	64.1%
ext/datastore/bigquery/dataset.go	4	95.29%

Totals
Change from base Build 2368745500:	2.1%
Covered Lines:	7119
Relevant Lines:	9233

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💛 - Coveralls