Remove ServiceExportConditionType

[tpantelis]

Now that ServiceExportCondition has been replaced by metav1.Condition, the ServiceExportConditionType is no longer used nor necessary. Change the constants to type string to match Condition.Type, which also avoids unnecessary casting.

[linux-foundation-easycla[bot]]

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• :white_check_mark: login: tpantelis / name: Thomas Pantelis (d90d0fdb2df53581a8cc64ff1c9cfe48173f62ed)

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[tpantelis]

/cc @skitt

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[tpantelis]

/assign @JeremyOT @lauralorenz

[lauralorenz]

/lgtm /approve

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