Remove isExpression flag and implement convertToIfCondition to align with Go parser architecture (#217)

workflow-parser/testdata/skipped-tests.txt

@@ -50,7 +50,6 @@ errors-step-uses-syntax.yml
 errors-unclosed-tokens.yml
 errors-yaml-invalid-style.yml
 errors-yaml-tags-explicit-unsupported.yml
-escape-html-values.yml
 float-folded-style.yml
 insert.yml
 is-partial-rerun.yml
@@ -59,7 +58,6 @@ job-cancel-timeout-minutes.yml
 job-concurrency.yml
 job-continue-on-error.yml
 job-defaults.yml
-job-if.yml
 job-permissions.yml
 job-timeout-minutes.yml
 matrix-basic.yml