feat: Add a "Assigned User" link field in the Project Template Task doctype

[MyuddinKhatri]

Task

• Add a "Assigned User" link field in the Project Template Task doctype.
• Whenever a project is created from that template the assignment should get carry forwarded to the tasks in the project.
• Duplicated or auto-repeated (Auto Repeat doctype) using a project template, assign the tasks in the project to the user from the above field.

[coveralls]

Pull Request Test Coverage Report for Build 1949

• 3 of 9 (33.33%) changed or added relevant lines in 1 file are covered.
• 115 unchanged lines in 4 files lost coverage.
• Overall coverage remained the same at 0.0%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
erpnext/projects/doctype/project/project.py	3	9	33.33%

Files with Coverage Reduction	New Missed Lines	%
erpnext/projects/doctype/project/project.py	1	39.26%
erpnext/hr/doctype/salary_slip/test_salary_slip.py	3	91.53%
erpnext/stock/doctype/quality_inspection/quality_inspection.py	39	36.36%
erpnext/manufacturing/doctype/job_card/job_card.py	72	24.16%

Totals
Change from base Build 1938:	0.0%
Covered Lines:	0
Relevant Lines:	0

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💛 - Coveralls