fix(ci): replace gitParameter with string parameter

Recent upgrade of Jenkins and Git Paramter plugin caused these to appear:

[2025-11-07T12:07:08.487Z] Scheduling project: status-desktop » e2e » prs
Invalid parameter value: (StringParameterValue) GIT_REF='6e42ff2a5cb10933332d6722e1c19babc9973c07'

Which are caused by recently patched vulnerability in the plugin:
https://www.jenkins.io/security/advisory/2025-07-09/#SECURITY-3419
https://github.com/jenkinsci/git-parameter-plugin/releases/tag/444.vca_b_84d3703c2

We could disable this check with:

gitParameterDefinition.allowAnyParameterValue=true

But just using a String paramater is simpler and more convenient.

Signed-off-by: Jakub Sokołowski <jakub@status.im>

Author: jakubgs

ci/Jenkinsfile.tests-e2e

@@ -19,17 +19,10 @@ pipeline {
   }
 
   parameters {
-    gitParameter(
+    string(
       name: 'GIT_REF',
       description: 'Git branch to checkout.',
-      branchFilter: 'origin/(.*)',
-      branch: '',
-      defaultValue: 'master',
-      quickFilterEnabled: false,
-      selectedValue: 'DEFAULT',
-      sortMode: 'ASCENDING_SMART',
-      tagFilter: '*',
-      type: 'PT_BRANCH'
+      defaultValue: 'master'
     )
     string(
       name: 'BUILD_SOURCE',

ci/Jenkinsfile.tests-e2e.windows

@@ -8,17 +8,10 @@ pipeline {
   }
 
   parameters {
-    gitParameter(
+    string(
       name: 'GIT_REF',
       description: 'Git branch to checkout.',
-      branchFilter: 'origin/(.*)',
-      branch: '',
-      defaultValue: 'master',
-      quickFilterEnabled: false,
-      selectedValue: 'DEFAULT',
-      sortMode: 'ASCENDING_SMART',
-      tagFilter: '*',
-      type: 'PT_BRANCH'
+      defaultValue: 'master'
     )
     string(
       name: 'BUILD_SOURCE',