[TASK] Change Lighthouse configuration

[MagdalenaLarge]

Description

Currently we are getting a warning in Lighthouse while doing the testing, but we do not get error message.
It means that errors are quite often missed.

Action
Investigate what is causing lack of error messages in the Lighthouse and fix it so any future issues are highlighted in error message

Ticket depends on completion of the tickets #215 , #216 , #217 , #218 , #219 .

Once you have finished with all above components change the below code from the lighthouse/lighthouserc.js :

OLD

assert: {
    assertions: {
        'categories:accessibility': ['warn', { minScore: 1 }],
    },
},

NEW

assert: {
    assertions: {
        'categories:accessibility': ['error', { minScore: 1 }],
    },
},

[rmccar]

Blocked waiting for other PRs to be merged

[rmccar]

The scope of this ticket will need to be extended to look into ignoring the issues we have with the setting of the aria-expanded attribute on radios. This is covered in #216

[rmccar]

Blocked waiting on outcome of #216