fix(progressbar): fix flaky TestCounter_Start unit test

[cx-artur-ribeiro]

Reason for Proposed Changes

• TestCounter_Start randomly failed due to race condition and off-by-one error;

Proposed Changes

• Corrected the number of expected progress updates (from 10 to 9);
• Ensured process completes before verifying results;
• Fixed a wrong increment in Start() caused by the progress channel closing.

Example Error
=== RUN TestCounter_Start/test_counter_progress_bar
counter_progress_test.go:52:
Error Trace: /home/runner/work/kics/kics/pkg/progress/counter/counter_progress_test.go:52
Error: Not equal:
expected: 9
actual : 10
Test: TestCounter_Start/test_counter_progress_bar

I submit this contribution under the Apache-2.0 license.

[github-actions]

KICS version: v2.1.11

Category Results CRITICAL 0 HIGH 0 MEDIUM 0 LOW 0 INFO 0 TRACE 0 TOTAL 0	Metric Values Files scanned 1 Files parsed 1 Files failed to scan 0 Total executed queries 47 Queries failed to execute 0 Execution time 0

[cx-eduardo-semanas]

LGTM

[cx-rui-araujo]

@cx-artur-ribeiro check my comment