tstest/integration/testcontrol: add experiment.reco implementation

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Select the published reco-backed test server with a build tag while
preserving the default implementation and existing caller API. Pin the
public module with its proxy-verified checksums; no workspace is needed.

Accept incremental peer messages in the TSP test. Exercise legacy map
semantics with the default server and version-floor rejection with reco,
including current-version streaming, without manual test skips.

Document GOFLAGS usage so child Go builds inherit the experiment tag.

Updates tailscale/corp#49097

Change-Id: I9b3e086c4c6a9a57a076e76b883422875c843f20
Signed-off-by: Brad Fitzpatrick <bradfitz@tailscale.com>

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