Use Conjur CLI v8.0

[szh]

Desired Outcome

Update demo to use CLI v8.0.

Implemented Changes

• Updated scripts and manifests to refer to the v8 Conjur CLI tag and use the updated command syntax.'
• Convert load_policies.sh script to use sh since new CLI container doesn't contain bash
• Use newly released version of the oss helm charts. (Depends on Uptick chart version to 2.0.6 cyberark/conjur-oss-helm-chart#180)

Connected Issue/Story

CyberArk internal issue ID: ONYX-33379

Depends on cyberark/kubernetes-conjur-deploy#183

Changelog

• The CHANGELOG has been updated, or
• 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
• 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]
• 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
• 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
• There are no security aspects to these changes

[john-odonnell]

LGTM 👍