fix: rename stepLength to stepCount

[k1LoW]

This pull request renames the pipeline linting rule from "StepLength" to "StepCount" throughout the codebase and documentation to better reflect its purpose (limiting the number of steps in a pipeline). The changes ensure consistency across configuration files, code, tests, and documentation.

Renaming and Refactoring Pipeline Step Rule:

• Renamed the struct StepLength to StepCount and updated its usage in the config/config.go file and related configuration logic. [1] [2]
• Updated all references in the codebase from StepLength to StepCount, including variable names, configuration fields, and logic in tailor/lint.go.
• Adjusted tests and test helpers to use StepCount instead of StepLength, ensuring tests reflect the new naming. [1] [2]

Documentation Updates:

• Updated the documentation in README.md to replace "stepLength" with "stepCount" and revised descriptions to clarify that the rule limits the number of steps, not their length. [1] [2]

[github-actions]

Code Metrics Report

Coverage	Code to Test Ratio
32.5%	1:1.7

Code coverage of files in pull request scope (73.8%)

Files	Coverage
config/config.go	0.0%
tailor/lint.go	98.4%

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Reported by octocov