fix: seatsCap wrong limit calculation

[tapiarafael]

Proposed changes (including videos or screenshots)

It is impossible to use the total number of license seats. The user is prevented from creating a new user when the seat counter is on the last available seat.
Setting the default value of the counter in the validation to zero instead of one, the user will be able to use the total license seat capacity.

Issue(s)

Steps to test or reproduce

In a workspace with an enterprise license:

1. Create users until you have only one seat left;
2. Try to create a new user to reach the maximum seat capacity;
3. An error-license-user-limit-reached error will be shown;

Further comments

SUP-364

[changeset-bot]

⚠️ No Changeset found

Latest commit: 7dd3fb8

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[codecov]

Codecov Report

Merging #30508 (7dd3fb8) into develop (2872428) will decrease coverage by 0.04%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           develop   #30508      +/-   ##
===========================================
- Coverage    50.23%   50.19%   -0.04%     
===========================================
  Files          780      774       -6     
  Lines        14475    14454      -21     
  Branches      2616     2612       -4     
===========================================
- Hits          7271     7255      -16     
+ Misses        6809     6791      -18     
- Partials       395      408      +13     

Flag	Coverage Δ
e2e	48.55% <ø> (-0.04%)	⬇️
unit	60.80% <ø> (ø)

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[tapiarafael]

Fixed by #30287