Add Syncthing to the Helm chart

[JohnStrunk]

Describe what this PR does

• Adds Syncthing to the Helm chart so that its images can be customized like the other movers
• Updates the GH workflow to properly load the ST image under test instead of :latest

Is there anything that requires special attention?

Related issues:

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!   

0 Bugs
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No Coverage information
2.3% Duplication

[JohnStrunk]

/cc @RobotSail

[openshift-ci]

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

Test name	Commit	Details	Required	Rerun command
ci/prow/e2e-openshift	9bce9cd	link	false	/test e2e-openshift

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[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JohnStrunk, RobotSail

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