Enhance handling of non-integer values around replica checks in Operator Helm Chart

[akukhar]

Description of your changes:

This PR improves the replica checks in the operator.pdb.yaml and webhookserver.pdb.yaml templates. The conditions have been modified to handle non-integer values, enabling compatibility with commands such as 'helm install --set ...'.

Which issue is resolved by this Pull Request:
No GH issue has been opened so far.

PR improves compatibility with helm CLI and indirectly with set {} blocks of Terraform's helm provider.

Here is how to reproduce the problem:

$ helm -n scylla-operator install --set replicas=3 scylla-operator .
Error: INSTALLATION FAILED: template: scylla-operator/templates/operator.pdb.yaml:1:7: executing "scylla-operator/templates/operator.pdb.yaml" at <gt .Values.replicas 1.0>: error calling gt: incompatible types for comparison
$

[zimnx]

/lgtm

[scylla-operator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: akukhar, zimnx

The full list of commands accepted by this bot can be found here.

The pull request process is described here

Needs approval from an approver in each of these files:

• OWNERS [zimnx]

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[tnozicka]

/retest

[tnozicka]

/test all

[scylla-operator-bot]

@akukhar: 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-gke	1776463	link	true	/test e2e-gke

Full PR test history. Your PR dashboard.

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository. I understand the commands that are listed here.