GP-8107: Add link to campaign in activity tab

[pfigel]

This adds a link to the campaign view from the activity tab, making it consistent with templates/CRM/Fastactivity/Form/View.tpl.

[bjendres]

@pfigel: This only works if the campaign manager is used, we should cover both cases....

[pfigel]

@bjendres I think that's covered by:

de.systopia.fastactivity/fastactivity.php

Lines 194 to 205 in 751278b

	if ((bool) CRM_Fastactivity_Settings::getValue('tab_col_campaign_title')) {
	// Make sure campaign extension is loaded
	if (!CRM_Extension_System::singleton()
	->getMapper()
	->isActiveModule('campaign')) {
	$messages[] = new CRM_Utils_Check_Message(
	'fastactivity_campaign',
	ts('FastActivity uses campaigntree API. Please install the extension "de.systopia.campaign".'),
	ts('CampaignTree API Required'),
	\Psr\Log\LogLevel::CRITICAL
	);
	}

[bjendres]

Thanks @pfigel