[IMP] energy_selfconsumption: contract generation improvment

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Changelog

• [IMP] energy_selfconsumption: wizard view showing warning text
• [IMP] energy_selfconsumption: added start_date to generation wizard and used to create contracts with the selected date
• [IMP] energy_selfconsumption: constraint on start_date so can select a date inferior of three months before today (90 days).

added ToBeReviewed label

requested review from @ebuzey-somit

assigned to @DaniilDigtyar

approved this merge request

added 1 commit

• 4be586ce - [FIX] energy_selfconsumption: next_period not computing correctly when...

Compare with previous version

Fixed a bug where period was not computed correctly, check the last commit @ebuzey-somit Thanks.

removed ToBeReviewed label

added ToBeMerged label

PO approved the feature, merged.

mentioned in commit f52a7827

merged

mentioned in merge request !277 (merged)

unassigned @DaniilDigtyar