fix: only send invocationId to Workflows plugin if ASPECT_BEP_WRITE_LAST_VIA_PIPE is set

[gregmagolan]

Only if ASPECT_BEP_WRITE_LAST_VIA_PIPE is set is the generated invocation ID for the bessie BES stream valid.

[aspect-workflows]

Test

12 test targets passed

Targets

//integration_tests/aspect:configure_test [k8-fastbuild] 1m 39s
//integration_tests/aspect:flags_test [k8-fastbuild]     1m 35s
//integration_tests/aspect:help_test [k8-fastbuild]      1m 42s
//integration_tests/aspect:hints_test [k8-fastbuild]     1m 34s
//integration_tests/aspect:info_test [k8-fastbuild]      1m 23s
//integration_tests/aspect:init_test [k8-fastbuild]      40s
//integration_tests/aspect:lint_test [k8-fastbuild]      41s
//integration_tests/aspect:reenter_test [k8-fastbuild]   21s
//integration_tests/aspect:run_test [k8-fastbuild]       1m 23s
//integration_tests/aspect:version_test [k8-fastbuild]   1m 40s
//pkg/plugin/system/bep:bep_test [k8-fastbuild]          71ms
//pkg/plugin/system:system_test [k8-fastbuild]           136ms

Total test execution time was 12m 42s. 91 tests (88.3%) were fully cached saving 9s.

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