Implement tenant deletion for empty tenants #7767

Job	Run time
Lint	1m 6s
Test packages - pkg	2m 28s
Test integration e2e suite	27m 18s
Test packages - others	9m 31s
Test packages - tempodb	10m 1s
Test packages - tempodb/wal	7m 42s
Benchmark	8m 59s
Build	1m 34s
Test serverless integration e2e suite	6m 14s
Build technical documentation	23s
Check jsonnet & tempo-mixin	43s
Vendor check	1m 1s
	1h 17m 0s

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