Add test target and upgrade libgit2

[dbadura]

Description

Changes proposed in this pull request:

• upgrade libgit2 to 1.5.2
• install envtest while running test

Related issue(s)
kyma-project/test-infra#8513

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[kyma-bot]

Skipping CI for Draft Pull Request.
If you want CI signal for your change, please convert it to an actual PR.
You can still manually trigger a test run with /test all

[dbadura]

/test all

[dbadura]

/test all

[dbadura]

/test all

[dbadura]

/test all

[dbadura]

/test all

[kwiatekus]

/test all

[kyma-bot]

@dbadura: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-function-controller-lint	972b29d	link	false	/test pull-function-controller-lint
pull-kyma-governance	972b29d	link	false	/test pull-kyma-governance

Full PR test history. Your PR dashboard.

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