Add a free text field for additional information on the "Analysis" block [#3587920]

Problem/Motivation

Discussing today in out Tech Drop-in call, Victoria, from Croydon Council told us that their electoral services team would like to report additional information about rejected ballot papers.

This includes:

Reason ballot papers were rejected
Election information (number of vacant seats, total number of ballot paper

Issue fork localgov_elections-3587920

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feat/further-detail-field changes, plain diff MR !42
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3587920-add-a-free changes, plain diff MR !39
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