Ignore the column token in ci_runners

Narendranrequested to merge
narendran-kannan/554449/ignore-token-runner into master

What does this MR do and why?

As we are removing plain tokens in ci_runners table, we already migrated the plain tokens to the encrypted one last milestone and to avoid the downtime in column removal migration. As a first step, added token as ignored column in the runner model.

References

Ignore the column `token` in `ci_runners` (#554449 - closed)

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