Advance deprecation cycle for Zenodo functions (#285)

* Consolidate deprecated functions and simplify tests

Co-authored-by: sbfnk-bot <242615673+sbfnk-bot@users.noreply.github.com>

* Regenerate documentation

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* Address code review feedback

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* Fix nested deprecation warning and find_common_prefix edge cases

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* Brace early-return guard clauses in find_common_prefix

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* Fix is_doi regex and restore offline input validation tests

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* Fix roxygen seealso tag, find_common_prefix single-file case, and lint

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* Fix min(grep()) Inf warning and use cli::cli_inform consistently

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Author: sbfnk

NEWS.md

@@ -1,3 +1,11 @@
+# socialmixr (development version)
+
+* `get_survey()`, `download_survey()`, `list_surveys()`, `get_citation()`, and
+  `survey_countries()` now warn unconditionally when called. These functions
+  were soft-deprecated in 0.5.0 and users should switch to the
+  [contactsurveys](https://cran.r-project.org/package=contactsurveys) package
+  (#269).
+
 # socialmixr 0.5.1
 
 This is a patch release with a bug fix and documentation updates.