Remove 4.15 nightlies and references for EOL (#3300)

Update compatbility matrix for 4.20

Author: sebrandon1

.github/workflows/qe-ocp-415-intrusive.yaml

@@ -2,7 +2,6 @@
 
 ![build](https://github.com/redhat-best-practices-for-k8s/certsuite/actions/workflows/merge.yaml/badge.svg)
 [![QE OCP 4.14 Testing](https://github.com/redhat-best-practices-for-k8s/certsuite/actions/workflows/qe-ocp-414.yaml/badge.svg)](https://github.com/redhat-best-practices-for-k8s/certsuite/actions/workflows/qe-ocp-414.yaml)
-[![QE OCP 4.15 Testing](https://github.com/redhat-best-practices-for-k8s/certsuite/actions/workflows/qe-ocp-415.yaml/badge.svg)](https://github.com/redhat-best-practices-for-k8s/certsuite/actions/workflows/qe-ocp-415.yaml)
 [![OpenSSF Scorecard](https://api.scorecard.dev/projects/github.com/redhat-best-practices-for-k8s/certsuite/badge)](https://scorecard.dev/viewer/?uri=github.com/)
 [![go-doc](https://godoc.org/github.com/?status.svg)](https://godoc.org/github.com/)
 [![release)](https://img.shields.io/github/v/release/redhat-best-practices-for-k8s/certsuite?color=blue&label=%20&logo=semver&logoColor=white&style=flat)](https://github.com/redhat-best-practices-for-k8s/certsuite/releases)

.github/workflows/qe-ocp-415.yaml

@@ -910,20 +910,6 @@ <h1>🌙 Certsuite Nightly Dashboard</h1>
                     </div>
                 </div>
 
-                <!-- OCP 4.15 Regular -->
-                <div class="ocp-card">
-                    <a href="https://github.com/redhat-best-practices-for-k8s/certsuite/actions/workflows/qe-ocp-415.yaml" 
-                       target="_blank" 
-                       class="ocp-version-link"
-                       title="View QE OCP 4.15 Testing workflow runs on GitHub">
-                        OpenShift 4.15
-                    </a>
-                    <div id="ocp-415-regular-content" class="loading">
-                        <div class="spinner"></div>
-                        Loading...
-                    </div>
-                </div>
-
                 <!-- OCP 4.16 Regular -->
                 <div class="ocp-card">
                     <a href="https://github.com/redhat-best-practices-for-k8s/certsuite/actions/workflows/qe-ocp-416.yaml" 
@@ -1030,20 +1016,6 @@ <h1>🌙 Certsuite Nightly Dashboard</h1>
                     </div>
                 </div>
 
-                <!-- OCP 4.15 Intrusive -->
-                <div class="ocp-card">
-                    <a href="https://github.com/redhat-best-practices-for-k8s/certsuite/actions/workflows/qe-ocp-415-intrusive.yaml" 
-                       target="_blank" 
-                       class="ocp-version-link"
-                       title="View QE OCP 4.15 Intrusive Testing workflow runs on GitHub">
-                        OpenShift 4.15
-                    </a>
-                    <div id="ocp-415-intrusive-content" class="loading">
-                        <div class="spinner"></div>
-                        Loading...
-                    </div>
-                </div>
-
                 <!-- OCP 4.16 Intrusive -->
                 <div class="ocp-card">
                     <a href="https://github.com/redhat-best-practices-for-k8s/certsuite/actions/workflows/qe-ocp-416-intrusive.yaml" 
@@ -1474,10 +1446,6 @@ <h2>📊 Test Suite Performance Ranking</h2>
                 regular: 'QE OCP 4.14 Testing',
                 intrusive: 'QE OCP 4.14 Intrusive Testing'
             },
-            '4.15': {
-                regular: 'QE OCP 4.15 Testing',
-                intrusive: 'QE OCP 4.15 Intrusive Testing'
-            },
             '4.16': {
                 regular: 'QE OCP 4.16 Testing',
                 intrusive: 'QE OCP 4.16 Intrusive Testing'
@@ -1606,8 +1574,6 @@ <h2>📊 Test Suite Performance Ranking</h2>
         const WORKFLOW_FILE_MAP = {
             'QE OCP 4.14 Testing': 'qe-ocp-414.yaml',
             'QE OCP 4.14 Intrusive Testing': 'qe-ocp-414-intrusive.yaml',
-            'QE OCP 4.15 Testing': 'qe-ocp-415.yaml',
-            'QE OCP 4.15 Intrusive Testing': 'qe-ocp-415-intrusive.yaml',
             'QE OCP 4.16 Testing': 'qe-ocp-416.yaml',
             'QE OCP 4.16 Intrusive Testing': 'qe-ocp-416-intrusive.yaml',
             'QE OCP 4.17 Testing': 'qe-ocp-417.yaml',

README.md

@@ -56,7 +56,7 @@ type VersionInfo struct {
 }
 
 var (
-	ocpBetaVersions   = []string{"4.13", "4.14", "4.15", "4.16", "4.17", "4.18", "4.19", "4.20", "4.21"}
+	ocpBetaVersions   = []string{"4.13", "4.14", "4.16", "4.17", "4.18", "4.19", "4.20", "4.21"}
 	ocpLifeCycleDates = map[string]VersionInfo{
 		// TODO: Adjust all of these periodically to make sure they are up to date with the lifecycle
 		// update documentation.