feat: Make v1alpha1 LogPipeline input disableable

[skhalash]

Description

Changes proposed in this pull request (what was done and why):

• Make the application input disableable as a preparation for feat: Add conversion webhook config to dev CRD variant #1463. The input is enabled by default

Changes refer to particular issues, PRs or documents:

• feat: Add conversion webhook config to dev CRD variant #1463

Traceability

• The PR is linked to a GitHub issue.
• The follow-up issues (if any) are linked in the Related Issues section.
• If the change is user-facing, the documentation has been adjusted.
• The feature is unit-tested.
• The feature is e2e-tested.

[skhalash]

/hold

[shorim]

Should we add an e2e test to check that no logs are collected when the application input is disabled?

[skhalash]

Not sure, I thought a unit test would be enough. I could add it if you think it's necessary.

[skhalash]

@shorim Added an E2E test

[skhalash]

/unhold