Handle Gbps in AWS database types

[nasark]

We were handling Gigabit in network_performance values but not properly handling cases where Gbps is used

@miq-bot add_label bug
@miq-bot assign @agrare
@miq-bot add_reviewer @agrare

[agrare]

With this applied locally I see these:

$ grep network_performance db/fixtures/aws_database_types.yml | egrep -v 'high|low|moderate'
  :network_performance: :12_gigabit
  :network_performance: :25,000_mbps
  :network_performance: :up_to_10,000_mbps
  :network_performance: :10,000_mbps

Seems like another case or two we might need to cover in the regex

[Fryguy]

Backported to radjabov in commit 2324e33.

commit 2324e33ea63416c4619bd4da884e217f507e2212
Author: Adam Grare <[email protected]>
Date:   Wed Oct 30 10:52:26 2024 -0400

    Merge pull request #873 from nasark/aws_db_types_nil_network_performance
    
    Handle Gbps in AWS database types
    
    (cherry picked from commit 2f931b37bbfa91ab2b5cd3403a32fd6b84f93b46)