feat: implement IsDirectory for OSS #12

Job	Run time
argoexec-image	5m 35s
Get changed files	4s
Windows Unit Tests	4m 34s
Unit Tests	3m 53s
Codegen	0s
Lint	3m 35s
UI	0s
E2E Tests (test-executor, minimal)	10m 15s
E2E Tests (test-corefunctional, minimal)	11m 57s
E2E Tests (test-functional, minimal)	20m 23s
E2E Tests (test-api, mysql)	6m 16s
E2E Tests (test-cli, mysql)	11m 29s
E2E Tests (test-cron, minimal)	7m 41s
E2E Tests (test-examples, minimal)	5m 58s
E2E Tests (test-plugins, plugins)	3m 42s
E2E Tests (test-java-sdk, minimal)	5m 37s
E2E Tests (test-python-sdk, minimal)	6m 37s
E2E Tests (test-executor, v1.25.11-k3s1, minimal)	15m 30s
E2E Tests (test-corefunctional, v1.25.11-k3s1, minimal)	11m 51s
E2E Tests (test-functional, v1.25.11-k3s1, minimal)	23m 46s
E2E Tests - Composite result	2s
	2h 38m 45s

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