test: add e2e confluence test

[baruchiro]

This pull request includes the following changes:

• Convert CLI to end-to-end tests

• Refactor the run function in the CLI struct

• Refactor e2e_test.go to add a confluence test

[github-actions[bot]]

KICS version: v1.7.13

| | Category | Results | | --- |--- | --- | |  | CRITICAL | 0 | |  | HIGH | 0 | |  | MEDIUM | 0 | |  | LOW | 1 | |  | INFO | 0 | |  | TRACE | 0 | |  | TOTAL | 1 |

| Metric | Values | | --- | --- | | Files scanned  | 1 | Files parsed  | 1 | Files failed to scan  | 0 | Total executed queries  | 49 | Queries failed to execute  | 0 | Execution time  | 1