Templating: global/system variables should be properly replaced in templated values. (#27394)

* Fixed so we try to use the variables in the redux store to replace values in template variables.

* First draft of working version.

* Including fieldPath when adding :text format.

* cleaned up code by introducing helper function.

* some minor refactoring.

* Added tests and support for multi variables.

* added test and code to handle the All scenario of a multivariable.

* fixed according to feedback.

* added docs.

* added text format to gdev dashboard.

* updated e2e tests.

* make sure we use the same function for formatting och variable lable.

* increased the number to 22.

* changed label for tests to be All.

* existing format should be respected.

e2e/suite1/specs/dashboard-templating.spec.ts

@@ -33,11 +33,12 @@ e2e.scenario({
       `Server:doublequote = "A'A\\"A","BB\\B","CCC"`,
       `Server:sqlstring = 'A''A"A','BB\\\B','CCC'`,
       `Server:date = null`,
+      `Server:text = All`,
     ];
 
     e2e()
       .get('.markdown-html li')
-      .should('have.length', 21)
+      .should('have.length', 22)
       .each(element => {
         items.push(element.text());
       })