Enable SignUp for mode="OPEN" only

[fiskus]

• Changelog entry (skip if change is not significant to end users, e.g. docs only)

[codecov]

Codecov Report

Merging #3725 (42171e5) into master (6ba9401) will decrease coverage by 0.20%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master    #3725      +/-   ##
==========================================
- Coverage   34.82%   34.62%   -0.20%     
==========================================
  Files         709      709              
  Lines       31104    31104              
  Branches     4637     4637              
==========================================
- Hits        10831    10769      -62     
- Misses      19124    19186      +62     
  Partials     1149     1149              

Flag	Coverage Δ
api-python	91.35% <ø> (ø)
catalog	9.25% <0.00%> (ø)
lambda	84.77% <ø> (-1.50%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
catalog/app/containers/App/App.js	0.00% <0.00%> (ø)
catalog/app/containers/Auth/PassReset.js	0.00% <0.00%> (ø)
catalog/app/containers/Auth/SignIn.js	0.00% <0.00%> (ø)

... and 2 files with indirect coverage changes

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[akarve]

I think we need something more general here, such as a flag to disable the SignUp route via config.js? @dimaryaz can you comment?

SignUp orthogonal to PasswordAuth, as even SSO stacks can sign up. The condition is more like in "PRODUCT" mode and under certain backend circumstances (sign up disabled, which is the common case) disable the route.

[dimaryaz]

I think this is correct.

In the past, SSO sign up had a second step, where the user had to enter a username - but that's gone now, so the sign in page is all that's necessary.