[DEVOPS-339] Fix if conditions in ephemeral deployment workflow (#98)

<details open>
<summary><a href="https://amuniversal.atlassian.net/browse/DEVOPS-339"
title="DEVOPS-339" target="_blank">DEVOPS-339</a></summary>
  <br />
  <table>
    <tr>
      <th>Summary</th>
<td>Ephemeral deployment workflow not deleting deployment or B2C
redirect URIs after PR closes</td>
    </tr>
    <tr>
      <th>Type</th>
      <td>
<img alt="Story"
src="https://amuniversal.atlassian.net/images/icons/issuetypes/story.png"
/>
        Story
      </td>
    </tr>
    <tr>
      <th>Status</th>
      <td>To Do</td>
    </tr>
    <tr>
      <th>Points</th>
      <td>N/A</td>
    </tr>
    <tr>
      <th>Labels</th>
      <td>-</td>
    </tr>
  </table>
</details>
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## Description

- Fix if conditions in ephemeral deployment workflow
  - Moved if condition from the `prepare` job to the `deploy` job.
- Fixed workflow triggers on a PR's 'synchronize', 'reopened', and
'opened' events by checking for all iterations of the `preview:` label.

## Related Links

<!-- List any links related to this pull request here

Replace "JIRA-XXX" with the your Jira issue key -->

- Jira Issue: DEVOPS-339
- Testing environment: [![📦️ Deploy Ephemeral
Environment](https://github.com/Andrews-McMeel-Universal/reusable_workflows-test/actions/workflows/ephemeral-deployments.yml/badge.svg?branch=story%2FDEVOPS-XXX%2Ftest-ephemeral-deployments)](https://github.com/Andrews-McMeel-Universal/reusable_workflows-test/actions/workflows/ephemeral-deployments.yml)

.github/workflows/ephemeral-deploy.yaml

@@ -60,7 +60,6 @@ env:
 jobs:
  prepare:
  name: Preparation Step
- if: ${{ github.event.action == 'labeled' && startsWith(github.event.label.name, 'preview:') || github.event_name == 'pull_request' && contains(github.event.pull_request.labels.*.name, 'preview:') }}
  runs-on: ubuntu-latest
  steps:
  - name: Get Jira ticket ID
@@ -119,6 +118,7 @@ jobs:
 
  deploy:
  name: Deploy Azure Container Instance
+ if: github.event_name == 'pull_request' && ((github.event.action == 'labeled' && startsWith(github.event.label.name, 'preview:')) || (contains(github.event.pull_request.labels.*.name, 'preview:development') || contains(github.event.pull_request.labels.*.name, 'preview:staging') || contains(github.event.pull_request.labels.*.name, 'preview:production')))
  needs: [prepare]
  runs-on: ubuntu-latest
  environment: