Change root cause analysis button position

What does this MR do and why?

Change root cause analysis button position

Use a sticky positioning for the AI troubleshoot button in jobs.

This change in positioning strategy helps the compatibility of the job details layout with a panel layout.

Why now?

Using a fixed positioning causes misalignment issues when Project Studio is enabled. I propose a "boring solution" that works as an alternative (and it looks good).

Changelog: changed

References

• !204581 (comment 2744145205)

Screenshots or screen recordings

Before	After

How to set up and validate locally

1. Setting AI troubleshooting can be a bit difficult. Instead, we can change the code to force the bottom to appear:

diff --git a/app/assets/javascripts/ci/job_details/job_app.vue b/app/assets/javascripts/ci/job_details/job_app.vue
index a8daf27babfb..811aafb60ab8 100644
--- a/app/assets/javascripts/ci/job_details/job_app.vue
+++ b/app/assets/javascripts/ci/job_details/job_app.vue
@@ -328,7 +328,7 @@ export default {
           <log :search-results="searchResults" />
 
           <nav
-            v-if="displayStickyFooter"
+            v-if="true || displayStickyFooter"
             :class="[
               'rca-bar-component gl-fixed gl-px-5 gl-py-2',
               { 'rca-bar-component-fullscreen': fullScreenEnabled },
diff --git a/ee/app/assets/javascripts/ci/job_details/components/root_cause_analysis_button.vue b/ee/app/assets/javascripts/ci/job_details/components/root_cause_analysis_button.vue
index 865dae9a29ec..96fbaadc1347 100644
--- a/ee/app/assets/javascripts/ci/job_details/components/root_cause_analysis_button.vue
+++ b/ee/app/assets/javascripts/ci/job_details/components/root_cause_analysis_button.vue
@@ -67,7 +67,7 @@ export default {
 </script>
 <template>
   <gl-button
-    v-if="shouldDisplayButton"
+    v-if="true || shouldDisplayButton"
     icon="duo-chat"
     variant="confirm"
     data-testid="rca-duo-button"

2. Visit a job page, and check the troubleshooting button's position.

MR acceptance checklist

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Related to #566240