Replace transfer-02 with transfer-06

[ndr-brt]

Feature Request

Given that the Http-proxy functionality in the data-plane will be deprecated, the sample transfer-02 will become soon obsolete.
The new transfer-06 will take its place.

Which Areas Would Be Affected?

e.g., DPF, CI, build, transfer, etc.

Why Is the Feature Desired?

Are there any requirements?

Who will sponsor this feature?

Please @-mention the committer that will sponsor your feature.

Solution Proposal

If possible, provide a (brief!) solution proposal.

[ronjaquensel]

Would it maybe make more sense to make the HTTP-PUSH sample transfer-02 and have the new proxy sample as transfer-03? Especially with the custom proxy implementation the PULL sample seems to be more complex than the PUSH sample, so switching these could make for a better flow through the samples.