[Feature] Extend goal templates to calculate percentages of available funds taking into account the priority level

[thennekx]

Verified feature request does not already exist?

• I have searched and found no existing issue

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• Would you like to implement this feature?

Pitch: what problem are you trying to solve?

The current behavior of setting a percentage of available funds does not take into account priorities set.
Priorities thus currently have no effect on the amount that is getting budgetted but rather on when it is budgetted.
This feature request is to have the option to also take into account priorities when budgetting a percentage of available funds.

The downside of current approach is that 1% of available funds on priority 99 is getting just as much budget than on priority 0.

		Requested behavior		Current behavior
	% of available funds	Assigned	Available funds	Assigned	Available funds
Start			1000		1000
Priority 1	50%	500	500	500	Not recalculated
Priority 2	10%	50	450	100	Not recalculated
Priority 3	10%	45	405	100	Not recalculated
Priority 4	10%	40,5	364,5	100	Not recalculated

For more details and history see the issue: #2426

Describe your ideal solution to this problem

To remain backwards compatible, the current approach can be kept, as it was a deliberate choice for easier manual calculation.
For clarity towards the end user there are multiple options:

1. A new keyword could be added like "% of available budget"
2. The existing keyword can be extended like "% of available funds prioritized"

Teaching and learning

For simplicity to the end user a new keyword might cause less confusion and it can be explicitly mentioned that it takes into account priorities.

[github-actions]

🎉 This feature has been implemented in #3754 and will be released in the next version. Thanks for sharing your idea! 🎉