Feature: Trusted Types support (#64975)

* Draft: Feature: Trusted Types support

* remove trusted-types package

* Create policy before jQuery and Angular is loaded and add feature flag

* Add trustedTypePolicies

* Sanitize scriptURL

* Add TT meta tag for test env

* Move trusted types into core

* Add DOMParser support for TrustedHTML

* Seperate RSS sanitization and add better TrustedHTML support

* Get test CSP header from config

* Remove dompurify dep from core

* Add documentation for trusted types

* Apply suggestions from code review

Co-authored-by: Kristian Bremberg <114284895+KristianGrafana@users.noreply.github.com>

* Add comment about Github discussion thread and things breaking

* Remove changes from News panel

* Remove TT feature toggle

* Expose TT and CSPReportOnly to frontend

* Log errors in console when CSP report only is enabled

* Log error for reporting and remove test mode

* Only insert CSP header in HTML for dev env

* Update docs

---------

Co-authored-by: Tobias Skarhed <tobias.skarhed@gmail.com>
Co-authored-by: Tobias Skarhed <1438972+tskarhed@users.noreply.github.com>

pkg/api/frontendsettings.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"fmt"
 	"net/http"
+	"strings"
 
 	"github.com/grafana/grafana/pkg/api/dtos"
 	"github.com/grafana/grafana/pkg/plugins"
@@ -89,6 +90,7 @@ func (hs *HTTPServer) getFrontendSettings(c *contextmodel.ReqContext) (*dtos.Fro
 
 	hasAccess := accesscontrol.HasAccess(hs.AccessControl, c)
 	secretsManagerPluginEnabled := kvstore.EvaluateRemoteSecretsPlugin(c.Req.Context(), hs.secretsPluginManager, hs.Cfg) == nil
+	trustedTypesDefaultPolicyEnabled := (hs.Cfg.CSPEnabled && strings.Contains(hs.Cfg.CSPTemplate, "require-trusted-types-for")) || (hs.Cfg.CSPReportOnlyEnabled && strings.Contains(hs.Cfg.CSPReportOnlyTemplate, "require-trusted-types-for"))
 
 	frontendSettings := &dtos.FrontendSettingsDTO{
 		DefaultDatasource:                   defaultDS,
@@ -137,6 +139,8 @@ func (hs *HTTPServer) getFrontendSettings(c *contextmodel.ReqContext) (*dtos.Fro
 		AngularSupportEnabled:               hs.Cfg.AngularSupportEnabled,
 		EditorsCanAdmin:                     hs.Cfg.EditorsCanAdmin,
 		DisableSanitizeHtml:                 hs.Cfg.DisableSanitizeHtml,
+		TrustedTypesDefaultPolicyEnabled:    trustedTypesDefaultPolicyEnabled,
+		CSPReportOnlyEnabled:                hs.Cfg.CSPReportOnlyEnabled,
 		DateFormats:                         hs.Cfg.DateFormats,
 		SecureSocksDSProxyEnabled:           hs.Cfg.SecureSocksDSProxy.Enabled,