Fix broken builds on conjur-authn-k8s-client repo

[diverdane]

Desired Outcome

Automated tests should not fail on the conjur-authn-k8s-client repo.

Jenkins tests and Github Actions tests on the conjur-authn-k8s-client repo are currently failing. Root cause appears to be that the example scripts in conjur-oss-helm-chart aren't setting a default value for the AUTHN_STRATEGY environment variable.

Implemented Changes

• Added default value for AUTHN_STRATEGY environment variables for example scripts.
• Fixed some typos.

Connected Issue/Story

Resolves #[relevant GitHub issue(s), e.g. 76]

CyberArk internal issue link: [insert issue ID]()

Definition of Done

• [x] Automated tests run for this repo.

Changelog

• [ ] The CHANGELOG has been updated, or
• [x] This PR does not include user-facing changes and doesn't require a CHANGELOG update

Test coverage

• [ ] This PR includes new unit and integration tests to go with the code changes, or
• [x] The changes in this PR do not require tests

Documentation

• [ ] Docs (e.g. READMEs) were updated in this PR
• [ ] A follow-up issue to update official docs has been filed here: [insert issue ID]()
• [x] This PR does not require updating any documentation

Behavior

• [ ] This PR changes product behavior and has been reviewed by a PO, or
• [ ] These changes are part of a larger initiative that will be reviewed later, or
• [x] No behavior was changed with this PR

Security

• [ ] Security architect has reviewed the changes in this PR,
• [ ] These changes are part of a larger initiative with a separate security review, or
• [x] There are no security aspects to these changes