Unify configuration option names used in ValidatorApp Scan and Sequencer configs

[pasindutennage-da]

Fixes #3496

decentralizedSynchronizerUrl: "https://sequencer-0.sv-1.scratchb.network.canton.global"
useSequencerConnectionsFromScan: false

Ensuring domain Synchronizer 'global' registered with config SynchronizerConnectionConfig
https://sequencer-0.sv-1.scratchb.network.canton.global

Nothing

Digital-Asset-1::
https://sequencer-0.sv-1.scratchb.network.canton.global/,


Digital-Asset-2::
[https://sequencer-0.sv-2.scratchb.network.canton.global,Digital-Asset-2](about:blank)

Digital-Asset-Eng-2
[https://sequencer-0.sv-2-eng.scratchb.network.canton.global,Digital-Asset-Eng-2](about:blank)

Digital-Asset-Eng-3:
https://sequencer-0.sv-3-eng.scratchb.network.canton.global,Digital-Asset-Eng-3

synchronizer:
 connectionType: "trust-single"
 url: "https://sequencer-0.sv-2.scratchb.network.canton.global"

Ensuring domain Synchronizer 'global' registered with config SynchronizerConnectionConfig

https://sequencer-0.sv-2.scratchb.network.canton.global:443

synchronizer:
 connectionType: "bft-custom"
 svNames: [ "Digital-Asset-Eng-2","Digital-Asset-Eng-3" ]
 threshold: 2

Digital-Asset-Eng-2::
https://sequencer-0.sv-2-eng.scratchb.network.canton.global/


Digital-Asset-Eng-3:
https://sequencer-0.sv-3-eng.scratchb.network.canton.global,

synchronizer:
 connectionType: "bft"

Digital-Asset-1:
https://sequencer-0.sv-1.scratchb.network.canton.global,,

Digital-Asset-2::
https://sequencer-0.sv-2.scratchb.network.canton.global/,

Digital-Asset-Eng-2::
https://sequencer-0.sv-2-eng.scratchb.network.canton.global/,

Digital-Asset-Eng-3: 
https://sequencer-0.sv-3-eng.scratchb.network.canton.global/,

[nicu-da]

Don't forget to mark the PR as ready for review

[nicu-da]

LGTM!