[JENKINS-74234] Remove unused Jelly view

[yaroslavafenkin]

https://issues.jenkins.io/browse/JENKINS-74234

Testing done

This snipped in present inline in

JiraTestResultReporter-plugin/src/main/resources/org/jenkinsci/plugins/JiraTestResultReporter/JiraTestDataPublisher/config.jelly

Lines 40 to 52 in a384e3c

	<div align="right">
	<span class="yui-button yui-push-button yui-button">
	<button id="validateJiraIssueConfig" type="button" onClick="validateFieldConfings()">Validate Fields</button>
	</span>
	<l:icon class="icon-help icon-sm" style="cursor:pointer" onclick="hideshow(document.getElementById('helpValidateJiraIssueConfig'))"/>
	<img src="${imagesURL}/spinner.gif" style="display:none" id="jiraSpinner"/>
	</div>
	<div id="helpValidateJiraIssueConfig" class="help" style="display:none">
	<p>Since Jira Rest API does not offer a way to validate field values, the plugin will try to create and delete an issue
	and it will print the errors (if any).</p>
	<p><b>WARNING: The user configured in the global configuration page needs to have permission to delete issues.</b></p>
	<p>Variables will not be expanded.</p>
	</div>

I haven't found any inclusions of helpValidateConfigButton.jelly via st:include, so I guess this is a dead code.

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• Ensure you have provided tests - that demonstrates feature works or fixes the issue

[basil]

Thanks!