Some fixes post v2.4.0

[alexsomesan]

Description

This change addresses some issues that made their way into release v2.4.0:

• delays checking the minimum version of Terraform in the manifest resource until after ConfigureProvider
• documents the minimum Terraform version for manifest resources
• aligns environment variable names used to set the feature gate flag for kubernetes_manifest
• fixes a dead link in the documentation

Acceptance tests

• Have you added an acceptance test for the functionality being added?
• Have you run the acceptance tests on this branch?

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestAccXXX'

...

Release Note

Release note for CHANGELOG:

BUG FIXES:

* restores compatibility with Terraform versions lower than 0.14.8 (#1341)

References

Fixes #1341

Community Note

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[ifs-anthonylecarrer]

I think this comment is not relevant

[ifs-anthonylecarrer]

There a lot of other constraints relating to terraform 0.14 on this branch. Is this PR complete to work with RF 0.12 and 0.13 ?

[alexsomesan]

You think the minimum supported Kubernetes version is not important to communicate to users?

[alexsomesan]

Which constraints do you suspect might prevent it from working with TF 0.12 / 0.13?

[github-actions]

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