tetragon: organize bpf helpers and add a few time related helpers #7017

Job	Run time
Build tetragon	4m 11s
Build tetragon	7m 49s
Test kernel ${{ matrix.kernel }} / test group ${{ matrix.group }}	0s
post-test	0s
post-test	3s
Test kernel 5.10-20240515.073534 / test group 0	28m 44s
Test kernel 5.15-20240515.073534 / test group 0	29m 56s
Test kernel 5.4-20240515.073534 / test group 0	26m 40s
Test kernel 4.19-20240515.073534 / test group 0	21m 26s
Test kernel 6.1-20240515.073534 / test group 0	23m 57s
Test kernel 6.6-20240515.073534 / test group 0	22m 16s
Test kernel bpf-next-20240527.013044 / test group 0	21m 30s
Test kernel rhel8-20240515.073534 / test group 0	24m 28s
	3h 31m 0s

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