feat: prepend patch env to existing env slices so developers can reference them later on

[SparkYuan]

…rence them later on.

What type of PR is this?

/kind feature

What this PR does / why we need it:

prepend patch env to existing env slices so developers can reference them later on.

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?

Additional documentation e.g., design docs, usage docs, etc.:

[coveralls]

Pull Request Test Coverage Report for Build 8277927170

Details

• 2 of 3 (66.67%) changed or added relevant lines in 2 files are covered.
• 4 unchanged lines in 2 files lost coverage.
• Overall coverage increased (+0.02%) to 72.439%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
pkg/modules/plugin.go	0	1	0.0%

Files with Coverage Reduction	New Missed Lines	%
pkg/engine/operation/watch.go	1	85.93%
pkg/engine/operation/parser/parser.go	3	79.27%

Totals
Change from base Build 8275253521:	0.02%
Covered Lines:	7275
Relevant Lines:	10043

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💛 - Coveralls

[liu-hm19]

lgtm