Migrate away from deprecated ioutil

[sebrandon1]

ioutil has been deprecated since Go 1.16: https://go.dev/doc/go1.16#ioutil

Tracking issue: redhat-best-practices-for-k8s/telco-bot#52

Modernization of file and stream operations:

• Replaced all instances of ioutil.ReadFile and ioutil.WriteFile with os.ReadFile and os.WriteFile in production code and tests, ensuring up-to-date file I/O operations. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13] [14] [15] [16]

• Updated usage of ioutil.TempFile and ioutil.TempDir to os.CreateTemp and os.MkdirTemp for creating temporary files and directories. [1] [2] [3]

• Changed ioutil.NopCloser and ioutil.Discard to their io equivalents (io.NopCloser, io.Discard) for stream handling. [1] [2]

Codebase cleanup:

• Removed all ioutil imports and replaced them with os and io where necessary across all affected files. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13]

These updates ensure the codebase is compatible with the latest Go standards and avoids deprecated APIs.

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