Breakout SAST Features in EE license

Description

Continuing the conversation from a comment in this MR from @ssarka:

Now is a good time to move features under static_analysis group.

STATIC_ANALYSIS_FEATURES = %i[
    sast
    sast_custom_rulesets
    sast_fp_reduction
    secret_detection
]

EEU_FEATURES = EEP_FEATURES + STATIC_ANALYSIS_FEATURES + %i[
...
...    
]

Tasks

• Determine how to breakout SAST features in the EE license
• Move SAST features into their own feature group.