chore: add Pylon variables to Docker build workflows (#41741)

Add APPSMITH_PYLON_APP_ID and APPSMITH_PYLON_IDENTITY_SECRET secrets to
all Docker image build workflows for Pylon integration.

## Description
Add environment variables for pylon chat widget for the build process


## Automation

/ok-to-test tags="@tag.Sanity"

### :mag: Cypress test results
<!-- This is an auto-generated comment: Cypress test results  -->
> [!TIP]
> 🟢 🟢 🟢 All cypress tests have passed! 🎉 🎉 🎉
> Workflow run:
<https://github.com/appsmithorg/appsmith/actions/runs/24473618960>
> Commit: 90f34fdecbfb1e5d0cc20a6331f3860ab9239ef8
> <a
href="https://internal.appsmith.com/app/cypress-dashboard/rundetails-65890b3c81d7400d08fa9ee5?branch=master&workflowId=24473618960&attempt=1"
target="_blank">Cypress dashboard</a>.
> Tags: `@tag.Sanity`
> Spec:
> <hr>Wed, 15 Apr 2026 19:53:48 UTC
<!-- end of auto-generated comment: Cypress test results  -->


## Communication
Should the DevRel and Marketing teams inform users about this change?
- [ ] Yes
- [ ] No


<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Chores**
* Updated CI/CD build configuration across multiple workflows to support
new build parameters.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>