fix(verify): default --show-builtin-errors to false

[dgeorgievski]

Change the default value of the --show-builtin-errors flag from true to false. This aligns the behavior of conftest verify with opa test and reduces verbosity by hiding Rego built-in errors by default.

Fixes: #1079

I have attached the original policy and tests rego files used as a demo for writing rego functions and their tests.
numbers.tgz

These tests files could be used to a demo of the change of the ``--show-builtin-errorsdefault value fromtrue` to `false`

Before

▶ conftest --version
Conftest: dev
OPA: 1.12.1

# show-builtin-erros default set to `true`
▶ conftest verify  \
--policy ./numbers \
--report=fails
Error: running verification: run test: [{eval_builtin_error to_number: strconv.ParseFloat: parsing "a": invalid syntax numbers/policy.rego:51 0x14000a09620} {eval_builtin_error to_number: strconv.ParseFloat: parsing "a": invalid syntax numbers/policy.rego:59 0x14000a40030} {eval_builtin_error to_number: strconv.ParseFloat: parsing "a": invalid syntax numbers/policy.rego:67 0x14000a40990}]

# show-builtin-erros set to `false`
▶ conftest verify  \
--policy ./numbers \
--report=fails --show-builtin-errors=false
numbers/policy_test.rego:
data.acme.numbers_test.test_compare2num_a_null_eq_b_cannot_compare: PASS (3.982ms)
data.acme.numbers_test.test_compare2num_a_str_eq_b: PASS (4.143583ms)
data.acme.numbers_test.test_compare2num_a_lt_b: PASS (4.135542ms)
data.acme.numbers_test.test_compare2num_a_letter_eq_b_cannot_compare: PASS (4.544875ms)
data.acme.numbers_test.test_not_3_is_gt_5: PASS (650.208µs)
data.acme.numbers_test.test_compare2num_a_gt_b: PASS (5.065709ms)
data.acme.numbers_test.test_compare2num_a_eq_b: PASS (1.145416ms)
data.acme.numbers_test.test_not_5_is_gt_5: PASS (5.217917ms)
data.acme.numbers_test.test_7_is_gt_5: PASS (1.174417ms)
data.acme.numbers_test.test_any_match_ok: PASS (5.327958ms)
data.acme.numbers_test.test_allow_ok: PASS (5.429625ms)
data.acme.numbers_test.test_any_match_fail: PASS (5.521375ms)
data.acme.numbers_test.test_allow_fail: PASS (6.16575ms)
--------------------------------------------------------------------------------
PASS: 13/13

After the change; Binary compiled with make from the repo

▶ ~/Projects/conftest/conftest --version
Conftest: 2f12-dirty
OPA: 1.15.2

# show-builtin-erros default set to `false`
▶ ~/Projects/conftest/conftest verify  \
--policy ./numbers \
--report=fails
numbers/policy_test.rego:74:
data.acme.numbers_test.test_compare2num_a_null_eq_b_cannot_compare: PASS (3.808708ms)
numbers/policy_test.rego:58:
data.acme.numbers_test.test_compare2num_a_lt_b: PASS (3.8145ms)
numbers/policy_test.rego:62:
data.acme.numbers_test.test_compare2num_a_eq_b: PASS (3.84475ms)
numbers/policy_test.rego:66:
data.acme.numbers_test.test_compare2num_a_str_eq_b: PASS (3.912875ms)
numbers/policy_test.rego:78:
data.acme.numbers_test.test_7_is_gt_5: PASS (160.125µs)
numbers/policy_test.rego:86:
data.acme.numbers_test.test_not_5_is_gt_5: PASS (4.007834ms)
numbers/policy_test.rego:82:
data.acme.numbers_test.test_not_3_is_gt_5: PASS (159.583µs)
numbers/policy_test.rego:70:
data.acme.numbers_test.test_compare2num_a_letter_eq_b_cannot_compare: PASS (175.708µs)
numbers/policy_test.rego:54:
data.acme.numbers_test.test_compare2num_a_gt_b: PASS (4.792792ms)
numbers/policy_test.rego:18:
data.acme.numbers_test.test_any_match_fail: PASS (5.049333ms)
numbers/policy_test.rego:6:
data.acme.numbers_test.test_any_match_ok: PASS (5.091958ms)
numbers/policy_test.rego:30:
data.acme.numbers_test.test_allow_ok: PASS (5.209208ms)
numbers/policy_test.rego:42:
data.acme.numbers_test.test_allow_fail: PASS (6.88575ms)
--------------------------------------------------------------------------------
PASS: 13/13

# set `show-builtin-errors` to true
▶ ~/Projects/conftest/conftest verify  \
--policy ./numbers \
--report=fails --show-builtin-errors=true
Error: running verification: run test: [{eval_builtin_error to_number: strconv.ParseFloat: parsing "a": invalid syntax numbers/policy.rego:51 0x14000b136e0} {eval_builtin_error to_number: strconv.ParseFloat: parsing "a": invalid syntax numbers/policy.rego:59 0x14000b440c0} {eval_builtin_error to_number: strconv.ParseFloat: parsing "a": invalid syntax numbers/policy.rego:67 0x14000b449f0}]