#1081 - add autoLogin setting to control whether we attempt autoLogin

[louise-davies]

Description

See title.

Also removed the authUrl argument from verifyUsernameAndPassword because it doesn't change so we can just reuse the old value

Testing instructions

Add a set up instructions describing how the reviewer should test the code

• Review code
• Check Actions build
• Review changes to test coverage
• No autologin error appears when using DLS authenticator and autoLogin: false

Agile board tracking

Closes #1081

[codecov]

Codecov Report

Merging #1084 (da1024d) into develop (6223ec1) will decrease coverage by 0.00%.
The diff coverage is 100.00%.

@@             Coverage Diff             @@
##           develop    #1084      +/-   ##
===========================================
- Coverage    97.95%   97.95%   -0.01%     
===========================================
  Files           42       42              
  Lines         1566     1565       -1     
  Branches       419      420       +1     
===========================================
- Hits          1534     1533       -1     
  Misses          31       31              
  Partials         1        1              

Impacted Files	Coverage Δ
src/state/reducers/scigateway.reducer.tsx	100.00% <ø> (ø)
src/state/scigateway.types.tsx	100.00% <ø> (ø)
src/authentication/icatAuthProvider.tsx	100.00% <100.00%> (ø)
src/loginPage/loginPage.component.tsx	98.51% <100.00%> (-0.02%)	⬇️
src/state/actions/scigateway.actions.tsx	98.14% <100.00%> (ø)

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[sam-glendenning]

Just made a small commit to clarify some meaning in tests - apart from that I'm happy (assuming the tests pass)