Investigate requiring username for Connect board

[juliasilge]

On Connect boards, there is some guessing that happens when you write a pin:

library(pins)
b <- board_rsconnect()
#> Connecting to RSC 2022.07.0 at <https://colorado.rstudio.com/rsc>
pin_write(b, mtcars, "mtcars-again")
#> Guessing `type = 'rds'`
#> Writing to pin 'julia.silge/mtcars-again'

^{Created on 2022-08-16 by the reprex package (v2.0.1)}

You cannot currently write a fully specified pin name including owner:

library(pins)
b <- board_rsconnect()
#> Connecting to RSC 2022.07.0 at <https://colorado.rstudio.com/rsc>
pin_write(b, mtcars, "julia.silge/mtcars")
#> Guessing `type = 'rds'`
#> Writing to pin 'julia.silge/julia.silge/mtcars'

^{Created on 2022-08-16 by the reprex package (v2.0.1)}

If you try to write a pin with a name that already exists on the board under another username, we get a not-so-helpful error:

library(pins)
b <- board_rsconnect()
#> Connecting to RSC 2022.07.0 at <https://colorado.rstudio.com/rsc>
pin_write(b, mtcars, "mtcars3")
#> Guessing `type = 'rds'`
#> Error in `rsc_check_status()` at pins-r/R/board_rsconnect.R:645:2:
#> ! RStudio Connect API failed [403]
#> • You don't have permission to change this item.

^{Created on 2022-08-16 by the reprex package (v2.0.1)}

The Python package requires a "fully specified" name including the username. Let's look into:

• requiring the username, like in Python (this would be a breaking change, although we could provide an escape hatch via environment variable like Python)
• fixing up rsc_parse_name() and related functions to avoid this unwanted behavior

Related to #613

[juliasilge]

I believe we got around the current problems with usernames in #643 and do not need to require the username on Connect at this time. Let's keep it in mind moving forward if more problem come up or this is too hard to maintain.

[github-actions[bot]]

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