Update Stripe redirect & add holding message

[joepavitt]

Description

• Directs users to /applications instead of /overview which no longer exists
• Adds a holding message which is very unlikely to be seen, as they join in trial, and setup an Application (for free) as part of the onboarding, but it's nice to be nice just in case this state does arise.

Related Issue(s)

Close #1955

Checklist

• I have read the contribution guidelines

[joepavitt]

I've seen this test failing randomly on a few occasions now, it should be resolved and fixed properly. Will open a separate PR for it.

⎯⎯⎯⎯⎯⎯⎯ Failed Tests 1 ⎯⎯⎯⎯⎯⎯⎯

 FAIL  test/unit/frontend/utils/elapsedTime.spec.js > elapsedTime > compares relative to now if only a to date is passed
AssertionError: expected '30 minutes, 14 seconds' to be '30 minutes, 15 seconds' // Object.is equality
 ❯ test/unit/frontend/utils/elapsedTime.spec.js:58:35
     56|         soon.setSeconds(soon.getSeconds() + 15)
     57| 
     58|         expect(elapsedTime(soon)).toBe('30 minutes, 15 seconds')
       |                                   ^
     59|     })
 Test Files  1 failed | 7 passed (8)
     60| 
      Tests  1 failed | 56 passed (57)

   Start at  17:49:42
  - Expected  - 1
   Duration  9.78s (transform 673ms, setup 1ms, collect 1.29s, tests 333ms, environment 4.48s, prepare 946ms)
  + Received  + 1


  - '30 minutes, 15 seconds'
  + '30 minutes, 14 seconds'
⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯[1/1]⎯

[Pezmc]

Suggested change

	async checkBillingSession () {
	checkBillingSession () {

[Pezmc]

This should be a computed property

[knolleary]

Adds a holding message which is very unlikely to be seen, as they join in trial, and setup an Application (for free) as part of the onboarding, but it's nice to be nice just in case this state does arise.

Setting up an application isn't part of onboarding. We setup the team for them without billing. If they choose to configure billing before they create their trial application then they will see this message.

They will also see this message if they choose to create a second team.