fix: PIN-6325 speed up data loading

Merge request

​ Changes:

• add missing indices
• remove redundant data load calls
• replace collect with collectLatest
• do not load data from db again when opening the report screen
• cache beneficiaries from last opened assistance ​

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Code should:

• make sense
• follow project conventions (architecture, tech stack, naming)
• not cointain any dead or unused code
• not cointain any technical debt or TODOs without Jira issue
• be tested
• be documented ​

The full code checklist as well as other useful information about the code review process are on the Code review wiki page

Closes PIN-6325