[16.0][IMP] base_tier_validation: Add subscription mode in tier definition

[BernatPForgeFlow]

trafficstars

Sometimes we may use Tier Validation for records that are communicating with the customer, and we don't want validators to receive notifications for the entire discussion. We introduce a new field 'Subscription mode' that allows to configure if we only want to receive Tier Validation notifications.

[OCA-git-bot]

Hi @LoisRForgeFlow, some modules you are maintaining are being modified, check this out!

[github-actions[bot]]

There hasn't been any activity on this pull request in the past 4 months, so it has been marked as stale and it will be closed automatically if no further activity occurs in the next 30 days. If you want this PR to never become stale, please ask a PSC member to apply the "no stale" label.

[AlexPForgeFlow]

@LoisRForgeFlow can we reopen?

[LoisRForgeFlow]

Closed in favor of #1043 1043