fix: deleteUsers - add pruning to options enums

[arnautov-anton]

Description of the changes, What, Why and How?

Adjust deleteUsers to match the documentation;

• adds missing pruning option to enums
• adjusts conditions
• makes options truly optional
• adds tests

[github-actions]

Size Change: +598 B (0%)

Total Size: 328 kB

Filename	Size	Change
dist/browser.es.js	70.5 kB	+150 B (0%)
dist/browser.full-bundle.min.js	43.7 kB	+8 B (0%)
dist/browser.js	71.5 kB	+148 B (0%)
dist/index.es.js	70.5 kB	+145 B (0%)
dist/index.js	71.5 kB	+147 B (0%)

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