Requirement list have extra capabilities from disabled elastic agent

Issue Summary

When adding requirement into a Job, the capabilities list have extra items that don't exist in the local and remote agents.

Steps to Reproduce

1. Do not configure or enable Elastic Bamboo function
2. Check the list of Executables in Bamboo at Administration >> Build Resources >> Executables
3. Try to add a new requirement in a Job

Expected Results

When adding new requirement, the drop down requirement list is the same as Executables in Bamboo

Actual Results

The drop down requirement list have extra requirement that does not exist in local and remote agents

Notes

• The extra capabilities comes from elastic agents
• Bamboo should remove this extra capabilities if Elastic Bamboo is disabled
• Its harder for user to add requirement to the Job cause the listed requirement may not exist in local and remote agents

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available