Remove undesirable_operator_linter() from .lintr_new

[IndrajeetPatil]

Closes #1766

Add it back once #1692 is resolved

[AshesITR]

There are a few more:

Targets
    Occurrences of 'nolint: undesirable_operator' in Project
Found Occurrences in Project  (9 usages found)
    Usage in comments  (9 usages found)
        lintr  (9 usages found)
            R  (9 usages found)
                expect_lint.R  (1 usage found)
                    87 itr <<- itr + 1L # nolint: undesirable_operator.
                get_source_expressions.R  (1 usage found)
                    591 cum_offset <<- cum_offset + offset # nolint: undesirable_operator.
                lint.R  (1 usage found)
                    670 substr(line, range[1L], range[2L]) <<- fill_with("~", range[2L] - range[1L] + 1L) # nolint: undesirable_operator.
                object_usage_linter.R  (1 usage found)
                    251 vals[[length(vals) + 1L]] <<- x # nolint: undesirable_operator.
                utils.R  (3 usages found)
                    31 res[[itr]] <<- x # nolint: undesirable_operator.
                    32 itr <<- itr + 1L # nolint: undesirable_operator.
                    177 terminal_newline <<- FALSE # nolint: undesirable_operator.
                zzz.R  (2 usages found)
                    298 default_settings <<- list( # nolint: undesirable_operator.
                    328 settings <<- list2env(default_settings, parent = emptyenv()) # nolint: undesirable_operator.

[codecov-commenter]

Codecov Report

Merging #1767 (a89a89b) into main (7a4fcee) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #1767   +/-   ##
=======================================
  Coverage   98.87%   98.87%           
=======================================
  Files         109      109           
  Lines        4623     4623           
=======================================
  Hits         4571     4571           
  Misses         52       52           

Impacted Files	Coverage Δ
R/expect_lint.R	100.00% <100.00%> (ø)
R/get_source_expressions.R	94.38% <100.00%> (ø)
R/lint.R	96.78% <100.00%> (ø)
R/object_usage_linter.R	99.39% <100.00%> (ø)
R/utils.R	98.26% <100.00%> (ø)

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