[SDK] Remove Final Keyword from constants

[andreyvelich]

I think, we should remove Final keyword from our constants in Python SDK.
Final is available only in >= Python 3.8 version: https://peps.python.org/pep-0591/
Currently, we say that Training Operator SDK is supported in Python 3 and 3.7.
Also, it's better to be compatible with other Kubeflow components SDKs, e.g. with Kubeflow Pipelines.

We can think about Python upgrade in the future releases/versions across various Kubeflow components.

cc @johnugeorge @tenzen-y @anencore94

[coveralls]

Pull Request Test Coverage Report for Build 3312804159

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 4 unchanged lines in 1 file lost coverage.
• Overall coverage decreased (-0.07%) to 39.493%

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Files with Coverage Reduction	New Missed Lines	%
pkg/controller.v1/mpi/mpijob_controller.go	4	77.2%

Totals
Change from base Build 3289337304:	-0.07%
Covered Lines:	2338
Relevant Lines:	5920

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💛 - Coveralls

[johnugeorge]

We have to soon upgrade
https://devguide.python.org/versions/

/lgtm
/approve

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[APPROVALNOTIFIER] This PR is APPROVED

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[tenzen-y]

/lgtm

[tenzen-y]

We have to soon upgrade https://devguide.python.org/versions/

/lgtm /approve

I think that we need to upgrade the minimal support python version to v3.8 still releasing training-operator 1.6.0.

[andreyvelich]

I think that we need to upgrade the minimal support python version to v3.8 still releasing training-operator 1.6.0

@tenzen-y We might need to have discussion around this, because various Kubeflow SDKs should be compatible between each other.

[tenzen-y]

I think that we need to upgrade the minimal support python version to v3.8 still releasing training-operator 1.6.0

@tenzen-y We might need to have discussion around this, because various Kubeflow SDKs should be compatible between each other.

Makes sense.
Or, we can stop supporting python v3.7 after 2023-06-27 which is EOL.

[anencore94]

I agree with you guys, we need to move the minimal support to v3.8 or above