feat universal: revert "add const for abs deadline propagation"

commit_hash:f0a2f438a7625ce8a80cdf54bdc6a91895c63053

Author: oigolovanova

universal/include/userver/utils/datetime_light.hpp

@@ -23,8 +23,6 @@ namespace utils::datetime {
 inline const std::string kRfc3339Format = "%Y-%m-%dT%H:%M:%E*S%Ez";
 /// @snippet utils/datetime/from_string_saturating_test.cpp  kTaximeterFormat
 inline const std::string kTaximeterFormat = "%Y-%m-%dT%H:%M:%E6SZ";
-/// @snippet utils/datetime/from_string_saturating_test.cpp  kAbsoluteDeadlineFormat
-inline const std::string kAbsoluteDeadlineFormat = "%Y-%m-%dT%H:%M:%E6SZ";
 inline constexpr std::time_t kStartOfTheEpoch = 0;
 /// @snippet utils/datetime_test.cpp  kDefaultDriverTimezone
 inline const std::string kDefaultDriverTimezone = "Europe/Moscow";

universal/src/utils/datetime/from_string_saturating_test.cpp

@@ -126,15 +126,6 @@ TEST(FromStringSaturation, kTaximeterFormat) {
     /// [kTaximeterFormat]
 }
 
-TEST(FromStringSaturation, kAbsoluteDeadlineFormat) {
-    /// [kAbsoluteDeadlineFormat]
-    const auto exp = utils::datetime::FromStringSaturating("2014-03-17 02:47:07.000000", "%Y-%m-%d %H:%M:%E*S");
-    const auto tp =
-        utils::datetime::FromStringSaturating("2014-03-17T02:47:07.000000Z", utils::datetime::kAbsoluteDeadlineFormat);
-    EXPECT_EQ(tp, exp);
-    /// [kAbsoluteDeadlineFormat]
-}
-
 TEST(FromStringSaturation, kDefaultFormat) {
     /// [kDefaultFormat]
     const auto exp = utils::datetime::FromStringSaturating("2014-03-17 02:47:07.000000", "%Y-%m-%d %H:%M:%E*S");