Werk #12762: Fix several XSS issues

Component	User interface
Title	Fix several XSS issues
Date	May 7, 2021
Level	Trivial Change
Class	Security Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0p4 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.6.0p25 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

• JavaScript was executed in the rule overview if a script was entered in the Text to match of EC rules.
• JavaScript was executed if scripts were entered in the LDAP server and failover server and "Save & Test" was clicked
• JavaScript was executed in the notification rules if sripts were entered in the the title and topic of aux tags and tags.

FEED-6031

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