Move namespace specifications below include directives

[jprestop]

Describe the Task

This issue arose from this comment on a previous pull request where we were tasked with removing the namespace specification from heater files. It was noted that best practice indicates that namespace specifications should be in the implementation files after any #include directives. This task is to move the namespace specifications below include directives.

Time Estimate

1-3 days of work

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Relevant Deadlines

none

Funding Source

TBD

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[jprestop]

The work was done in with this PR: #2831